PALEA and PALSA vs. Philippine Air Lines, Inc.

The correct divisor for computing the basic daily and hourly rate of monthly-salaried employees is the number of actual working days in a year, not 365 calendar days, because off-days are unpaid rest days and cannot be counted in the divisor. The ten-year prescriptive period under Article 1144(1) of the Civil Code applies to claims for pay differentials anchored on written collective bargaining agreements, not the three-year period under Section 7-a of Commonwealth Act No. 444, which governs only claims arising solely under the Eight-Hour Labor Law.

Philippine Air Lines, Inc. (PAL) is a government-controlled public utility corporation requiring year-round, uninterrupted operations. Its monthly-salaried employees were represented by two unions: the Philippine Air Lines Employees' Association (PALEA) and the Philippine Air Lines Supervisors' Association (PALSA). Over the years, PAL and these unions entered into successive collective bargaining agreements governing wages, overtime, premium pay for work on off-days, night differentials, and leave benefits. Since at least 1952, PAL had unilaterally adopted a formula for computing the basic daily and hourly rates of its monthly-salaried employees by multiplying the monthly salary by 12, dividing the product by 365 calendar days, and then dividing the quotient by 8 hours. The unions sought to revise this formula to use actual working days as the divisor, contending that the inclusion of unpaid off-days in the divisor artificially reduced the employees' basic rates and, consequently, all derivative pay computations.

Philippine Air Lines, Inc. (PAL), a government-controlled public utility corporation, employed monthly-salaried workers represented by two unions: the Philippine Air Lines Employees' Association (PALEA) and the Philippine Air Lines Supervisors' Association (PALSA). Since at least 1952, PAL had unilaterally adopted and consistently applied a formula for computing the basic daily and hourly rates of its monthly-salaried employees: the monthly salary was multiplied by 12, the product divided by 365 (the number of calendar days in a year) to arrive at the basic daily rate, and the quotient then divided by 8 to yield the basic hourly rate. This basic hourly rate served as the foundation for computing overtime pay, Sunday and legal holiday premium pay, night differential pay, and vacation and sick leave pay.

The unions sought to revise this formula by substituting the number of actual working days for 365 as the divisor. Under their proposed formula, the monthly salary multiplied by 12 would be divided by the number of actual working days in a year (304 days before September 4, 1961, and 258 days thereafter) to arrive at the basic daily rate, and the quotient divided by 8 for the basic hourly rate. The unions contended that off-days — Saturdays, Sundays, company-observed holidays, and other designated holidays — were not paid days under the collective bargaining agreements, as evidenced by the fact that when an employee worked on an off-day, he was paid an additional 25% or 37½% of his regular hourly rate, indicating that off-days carried no base compensation.

On February 14, 1963, PALEA and PALSA commenced an action against PAL in the Court of Industrial Relations, praying that PAL be ordered to revise its wage computation method and pay accrued salary differentials. On May 23, 1964, the CIR through Presiding Judge Jose S. Bautista denied the unions' prayer, declaring PAL's formula legal and proper and holding the unions estopped by their long-standing acquiescence, noting that the formula had been used since 1952 and that it was only on July 18, 1962 that PALSA first proposed a change — characterizing it as a mere proposal rather than a demand for correction under the law.

The unions moved for reconsideration on May 30, 1964, arguing that the use of 365 days as a divisor was contrary to law and evidence because it improperly included unpaid off-days, thereby reducing the employees' legitimate basic rates. On October 9, 1969, the CIR en banc, through Presiding Judge Arsenio I. Martinez, reversed its earlier resolution and sustained the unions' method of computation. However, the CIR limited the payment of pay differentials to effective July 1, 1957, the date of effectivity of Republic Act 1880 (the 40-Hour Week Law), treating the case as an incident of a related CIR case. Both parties appealed to the Supreme Court: PAL challenging the reversal on the wage formula, the finding of no estoppel, and the retroactivity of payment; and PALEA challenging the effectivity date, contending that the ten-year prescriptive period under Article 1144(1) of the Civil Code should govern, making the differentials recoverable from February 14, 1953.

In G.R. No. L-31343 (PAL's appeal):

• Correctness of Wage Formula: PAL argued that its formula of dividing annualized salary by 365 calendar days was correct, emphasizing that as a public utility requiring year-round operations, it had for many years treated off-days — including Saturdays, Sundays, company-observed holidays, and other designated holidays — as paid days, consistent with Section 19 of Republic Act 602 prohibiting reduction of wages for off-days, as sustained in Automotive Parts & Equipment Co., Inc. vs. Lingad.
• Estoppel and Laches: PAL maintained that the unions, by their long period of consent, acquiescence, inaction, and acceptance of benefits under the existing formula, were estopped and barred from claiming that PAL's formula was incorrect.
• Prescriptive Period: PAL argued that the claim for pay differentials was an action to enforce a cause of action under the Eight-Hour Labor Law (Commonwealth Act No. 444, as amended), and that under Section 7-a thereof, the three-year prescriptive period applied, limiting recovery to February 14, 1960 onward. PAL further contended that even if Article 1144(1) of the Civil Code were applicable, Commonwealth Act No. 444, as a special law, should prevail over the Civil Code as a general law in case of conflict.

In G.R. No. L-31341 (PALEA's appeal):

• Prescriptive Period: PALEA argued that pay differentials should be computed effective February 14, 1953 — ten years from the date of filing the original complaint on February 14, 1963 — because the claim was based on written contracts, namely the collective bargaining agreements between PAL and the employees' representative unions, and under Article 1144(1) of the Civil Code, actions based on written contracts prescribe in ten years.

• Unpaid Off-Days: The unions countered that off-days were not paid days, as evidenced by the fact that employees who worked on off-days were paid an additional 125% or 137½% of their basic hourly rate — a premium that would be illogical if off-days were already compensated. They argued that including unpaid off-days in the divisor artificially reduced the employees' basic daily and hourly rates.
• Prescription: The unions argued that since the claim arose from written contracts — the collective bargaining agreements — the action prescribed in ten years from the time the right of action accrued, pursuant to Article 1144(1) of the New Civil Code.

• Correct Wage Formula: Whether PAL's formula of dividing annualized monthly salary by 365 calendar days is the correct method for computing the basic daily and hourly rates of monthly-salaried employees, or whether the divisor should be the number of actual working days.
• Estoppel: Whether the unions are estopped or barred by laches from impugning PAL's wage computation formula by reason of their long-standing silence and acquiescence.
• Prescriptive Period: Whether the three-year prescriptive period under Section 7-a of Commonwealth Act No. 444 (the Eight-Hour Labor Law) or the ten-year prescriptive period under Article 1144(1) of the Civil Code governs the employees' claim for pay differentials.

• Correct Wage Formula: No. PAL's formula is incorrect. The divisor should be the number of actual working days in a year, not 365 calendar days, because off-days are unpaid rest days and cannot be included in the divisor without artificially diminishing the employee's legitimate basic rate.
• Estoppel: No. The unions are not estopped. The employees' silence was innocent silence, as PAL's formula was adopted unilaterally without their knowledge or express consent; moreover, estoppel and laches cannot bar recovery of overtime compensation as a matter of public policy under the Eight-Hour Labor Law.
• Prescriptive Period: The ten-year prescriptive period under Article 1144(1) of the Civil Code applies. The claim for pay differentials is principally anchored on written collective bargaining agreements, not solely on the Eight-Hour Labor Law, and therefore the prescriptive period for actions based on written contracts governs.

• Correct Wage Formula: The Court reasoned that off-days are rest days on which an employee is not required to work and therefore cannot demand pay. The basis of remuneration is actual service rendered. When a worker works on an off-day, welfare laws reward him with a premium (125% or 137½%) higher than his regular rate — a premium that would be illogical if off-days were already paid. Including unpaid off-days in the divisor of 365 artificially reduces the quotient (the basic daily and hourly rate), thereby depriving the employee of a portion of his legitimate pay. The Court applied the doctrine established in National Waterworks and Sewerage Authority vs. NWSA Consolidated Unions (G.R. No. L-18938, August 31, 1964), which held that the divisor should be actual working days. PAL's argument that the NAWASA doctrine should not apply to a public utility was rejected because NAWASA is itself a public utility requiring year-round operations and is a government-owned corporation akin to PAL, a government-controlled corporation. The Court further noted that PAL had bound itself through collective bargaining agreements to compensate employees working on off-days, just as NAWASA had — voluntarily undertaking a contractual obligation beyond the compulsion of law.

• Estoppel: The Court held that estoppel requires not mere innocent silence but some element of turpitude or negligence by which another is misled to his injury. PAL's wage formula was adopted unilaterally without the knowledge or express consent of the employees; they only later discovered its irregularity and its violation of the collective bargaining agreements. PALSA promptly proposed the correct method, which PAL ignored. The employees' silence was therefore innocent silence that cannot give rise to estoppel. The Court further held that, as a matter of public policy, estoppel and laches cannot arrest recovery of overtime compensation, relying on Manila Terminal Co. vs. CIR (G.R. No. L-9265, April 29, 1957), which held that applying estoppel would frustrate the purpose of the Eight-Hour Labor Law by allowing employees who cannot expressly renounce their right to extra compensation to be compelled to accomplish the same thing by mere silence or lapse of time. Additionally, a unilateral adoption of an irregular wage formula being an act against public policy, estoppel cannot validate it.

• Prescriptive Period: The Court held that the claim for pay differentials fundamentally involves strict compliance by PAL with the wage computation provisions embodied in the collective bargaining agreements executed between PAL and the representative unions, listing nine such agreements from 1952 to 1962. The three-year prescriptive period under Section 7-a of Commonwealth Act No. 444 applies only when the claim for overtime differentials is based solely on the Eight-Hour Labor Law and not on a collective bargaining agreement or any other contract. Here, the claim was not premised on Sections 3 and 4 of CA No. 444 but on the work computation provisions in the collective bargaining agreements. Since the claim was principally anchored on written contracts, the ten-year prescriptive period under Article 1144(1) of the Civil Code governs. The Court further held that in case of doubt as to which labor legislation to apply, that which enhances the plight of the workers should be followed, consonant with Article 1702 of the Civil Code. Accordingly, pay differentials were ordered effective February 14, 1953 — ten years prior to the filing of the complaint on February 14, 1963.

• Correct Divisor for Wage Computation — The divisor in computing an employee's basic daily rate from his monthly salary should be the number of actual working days in a year, not 365 calendar days. Off-days are unpaid rest days; including them in the divisor artificially reduces the employee's basic rate and derivative pay computations. The Court applied this by sustaining the unions' formula over PAL's, holding that the basis of remuneration is actual service rendered and that premium pay for work on off-days (125% or 137½%) confirms that off-days carry no base compensation.

• Innocent Silence Does Not Create Estoppel — Mere innocent silence will not work estoppel; there must be some element of turpitude or negligence connected with the silence by which another is misled to his injury. Where a wage formula is adopted unilaterally without the employees' knowledge or consent, their silence is innocent and cannot estop them from later challenging it. The Court applied this by holding that PAL's employees were not estopped because the formula was adopted without their knowledge, and they promptly sought correction upon discovering its irregularity.

• Estoppel and Laches Cannot Bar Recovery of Statutory Labor Benefits — As a matter of public policy, the doctrines of estoppel and laches cannot be invoked to bar recovery of overtime compensation under the Eight-Hour Labor Law, because employees cannot waive their right to extra compensation and applying estoppel would frustrate the law's purpose by indirection. The Court relied on Manila Terminal Co. vs. CIR to reject PAL's estoppel defense.

• Prescriptive Period for Claims Based on Collective Bargaining Agreements — When a claim for pay differentials is principally anchored on written collective bargaining agreements rather than solely on the Eight-Hour Labor Law, the ten-year prescriptive period under Article 1144(1) of the Civil Code governs, not the three-year period under Section 7-a of Commonwealth Act No. 444. The three-year period applies only when the claim is based solely on the statute and not on any contract.

• Doubt in Labor Legislation Resolved in Favor of Labor — In case of doubt as to what labor legislation to apply, that which would enhance the plight of the workers should be followed, pursuant to Article 1702 of the Civil Code, which provides that all labor legislation and labor contracts should be construed in favor of the safety and decent living of the laborer.

• "There should hardly be any doubt that off-days are not paid days, Precisely, off-days are rest days for the worker. He is not required to work on such days." — The Court states the ratio decidendi for the wage computation issue: off-days are unpaid and must be excluded from the divisor, grounding the ruling in the principle that remuneration is based on actual service rendered.

• "The principle of estoppel and laches cannot well be invoked against the Association. In the first place, it would be contrary to the spirit of the Eight-Hour Labor Law, under which, as already seen, the laborers cannot waive their right to extra compensation." — This passage from Manila Terminal Co. vs. CIR, quoted and adopted by the Court, articulates the public policy rationale against applying estoppel and laches to bar recovery of overtime compensation, and is the controlling formulation frequently cited in subsequent labor jurisprudence.

• "Since the claim for pay differentials is principally anchored on the written contracts between the litigants, the ten-year prescriptive period provided by Art. 1144(1) of the New Civil Code should govern." — The Court's dispositive reasoning on prescription, establishing that claims based on collective bargaining agreements are governed by the Civil Code's ten-year period for written contracts rather than the shorter statutory period under the Eight-Hour Labor Law.

• National Waterworks and Sewerage Authority vs. NWSA Consolidated Unions, G.R. No. L-18938, August 31, 1964, 11 SCRA 766 — Controlling precedent followed. The Court affirmed the NAWASA doctrine that the divisor for computing basic daily and hourly rates should be actual working days, not 365 calendar days. The Court rejected PAL's attempt to distinguish NAWASA as inapplicable to a public utility, noting NAWASA was itself a public utility with year-round operations and a government-owned corporation akin to PAL.
• Manila Terminal Co. vs. CIR, G.R. No. L-9265, April 29, 1957, 91 Phil. 625 — Controlling precedent followed. The Court relied on this case for the proposition that estoppel and laches cannot bar recovery of overtime compensation as a matter of public policy under the Eight-Hour Labor Law.
• Automotive Parts & Equipment Co., Inc. vs. Jose B. Lingad, G.R. No. L-26406, October 31, 1969 — Cited by PAL but effectively distinguished. PAL invoked this case to support treating off-days as paid days under Section 19 of Republic Act 602; the Court did not adopt PAL's reading and instead applied the NAWASA doctrine.
• Mirasol vs. Municipality of Tabaco, 43 Phil. 610 — Cited for the principle that estoppel depends on the circumstances of each case and that neglect or omission alleged to create estoppel must be evaluated in context.
• Lodovica vs. Court of Appeals, L-29678, July 18, 1975, 65 SCRA 154 — Cited for the rule that a party who had no knowledge of or gave no consent to a transaction may not be estopped by it.
• Auyong Hian vs. Court of Tax Appeals, 59 SCRA 110 — Cited for the proposition that a unilateral act against public policy cannot be validated by the doctrine of estoppel.
• Beronilla vs. GSIS, G.R. No. L-21723, November 26, 1970, 36 SCRA 44 — Cited for the formulation that mere innocent silence will not work estoppel without some element of turpitude or negligence.

• Article 1144(1), New Civil Code — Provides that actions upon a written contract prescribe in ten years. The Court applied this provision because the employees' claim for pay differentials was principally anchored on written collective bargaining agreements, not solely on the Eight-Hour Labor Law.
• Section 7-a, Commonwealth Act No. 444 (Eight-Hour Labor Law), as amended by Republic Act No. 1993 — Provides that any action to enforce a cause of action under the Act shall be commenced within three years. The Court held this provision inapplicable because the claim was based on collective bargaining agreements rather than solely on the statute.
• Article 1702, New Civil Code — Provides that in case of doubt, all labor legislation and labor contracts should be construed in favor of the safety and decent living of the laborer. The Court invoked this provision to resolve any doubt as to which prescriptive period should apply in favor of the longer, more beneficial period for workers.
• Section 19, Republic Act No. 602 — Prohibits reduction of wages for off-days. PAL cited this provision to argue off-days were paid days; the Court rejected this interpretation, holding that off-days are unpaid rest days and that premium pay for work on off-days confirms this.

Teehankee (Chairman), Esguerra, Muñoz Palma, and Martin, JJ., concurred.