Air Transportation Office vs. Ramos

Government agencies performing proprietary or business functions — such as the management, operation, and maintenance of airports — are not immune from suit even if unincorporated and even if performing functions incidental to public service; immunity is determined by the character of the function performed (jus imperii vs. jus gestionis), not by the corporate status of the agency.

The dispute arose from the Loakan Airport operations in Baguio City, where the ATO had been using a portion of private land (985 square meters) as part of the runway and running shoulder. After negotiations, the owners agreed to sell the land to the ATO, but the agency failed to pay, leading to a collection suit.

• RTC: Spouses Ramos filed a collection suit (Civil Case No. 4017-R) on April 29, 1998 before the RTC of Baguio City, Branch 61. The RTC denied ATO's motion for preliminary hearing on the defense of sovereign immunity (November 10, 1998) and its motion for reconsideration (December 10, 1998). On February 21, 2001, the RTC rendered judgment ordering the ATO to pay P778,150.00 plus interest, damages, and attorney's fees.
• CA: The ATO filed a petition for certiorari with the CA to assail the RTC's interlocutory orders, which the CA dismissed. The ATO subsequently appealed the RTC decision on the merits. On May 14, 2003, the CA affirmed the RTC decision with modification (reducing moral and exemplary damages to P30,000.00 each and attorney's fees to P10,000.00).
• SC: The ATO filed a petition for review on certiorari.

• Spouses David and Elisea Ramos owned land in Baguio City covered by Transfer Certificate of Title No. T-58894.
• The ATO had been using 985 square meters of this land as part of the runway and running shoulder of Loakan Airport.
• On August 11, 1995, the spouses executed a deed of sale conveying the affected portion to the ATO for P778,150.00.
• The ATO failed to pay despite verbal and written demands.
• On April 29, 1998, the spouses instituted an action for collection against the ATO and its officials.
• In its answer, the ATO invoked Proclamation No. 1358 (reserving the land for airport use) and asserted that the deed of sale was entered into in the performance of governmental functions, rendering the RTC without jurisdiction absent State consent.

• The ATO is an agency performing governmental functions — specifically, the maintenance and operation of aircraft and air navigational facilities and services.
• The deed of sale was executed in furtherance of these governmental functions.
• The RTC lacked jurisdiction because the State did not consent to be sued.
• The reservation of the land under Proclamation No. 1358 supported the claim of sovereign immunity.

• The ATO is engaged in proprietary functions pertaining to a private entity, specifically the management and maintenance of airport operations.
• Cited National Airports Corporation v. Teodoro and Civil Aeronautics Administration v. Court of Appeals to establish that airport management is essentially a business, not a sovereign function.
• The contract was a simple sale of land, not an exercise of sovereign power.
• The ATO should be compelled to pay the agreed consideration.

• Procedural Issues: N/A
• Substantive Issues:
  • Whether the ATO could be sued without the State's consent.
  • Whether the ATO performs governmental or proprietary functions.

• Procedural: N/A
• Substantive:
  • The ATO is not immune from suit. The SC upheld the CA's finding that the ATO, like its predecessor the Civil Aeronautics Administration (CAA), is engaged in functions pertaining to a private entity. Airport management and operation are proprietary functions (jus gestionis), not sovereign functions (jus imperii), as they are "essentially a business" and not an exclusive prerogative of the State.
  • The test for immunity is the character of the function, not incorporation status. Immunity is determined by whether the entity was organized for governmental or proprietary purposes. Since the ATO manages airports — a function that may be undertaken by private concerns — it divested itself of sovereign character regarding these activities.
  • Sovereign immunity cannot defeat claims for just compensation. Even assuming arguendo that the taking was pursuant to eminent domain (a sovereign function), the State cannot invoke immunity to avoid paying just compensation where no expropriation proceedings were conducted and no payment was made.
  • The issue is moot but obligations survive. The enactment of R.A. No. 9497 (Civil Aviation Authority Act of 2008) abolished the ATO and created the Civil Aviation Authority of the Philippines (CAAP), which assumed all ATO's powers, assets, and obligations. Section 23 of R.A. No. 9497 explicitly grants the CAAP corporate powers, including the power to sue and be sued. Thus, the ATO's contractual obligations to the Ramos spouses are now enforceable against the CAAP.

• Sovereign Immunity / Non-suability of the State — Rooted in Article XVI, Section 3 of the 1987 Constitution and the principle that "there can be no legal right as against the authority that makes the law on which the right depends." This immunity extends only to agencies performing governmental (jus imperii) functions, not proprietary (jus gestionis) functions.
• Jus Imperii vs. Jus Gestionis —
• Jus imperii: Governmental or sovereign acts (e.g., national defense, public health, expropriation) — immune from suit.
• Jus gestionis: Proprietary, commercial, or business acts (e.g., airport management, operation of public utilities) — not immune from suit.
• Test for Determining Immunity — "Not all government entities, whether corporate or non-corporate, are immune from suits. Immunity from suits is determined by the character of the objects for which the entity was organized." If the state engages in business operations through an agency or corporation, it divests itself of its sovereign character and impliedly consents to suits against that entity.
• Taking Without Just Compensation — The doctrine of sovereign immunity cannot be invoked to defeat a valid claim for compensation arising from the taking of private property without just compensation and without proper expropriation proceedings. The State cannot perpetrate injustice under the shield of immunity.

• "A sovereign is exempt from suit, not because of any formal conception or obsolete theory, but on the logical and practical ground that there can be no legal right as against the authority that makes the law on which the right depends." (citing Holmes in Kawananakoa v. Polyblank)
• "Not all government entities, whether corporate or non-corporate, are immune from suits. Immunity from suits is determined by the character of the objects for which the entity was organized."
• "The Civil Aeronautics Administration comes under the category of a private entity... created... not to maintain a necessary function of government, but to run what is essentially a business... It is engaged in an enterprise which, far from being the exclusive prerogative of state, may... be undertaken by private concerns." (citing National Airports Corporation v. Teodoro)
• "The doctrine of sovereign immunity was not an instrument for perpetrating any injustice on a citizen."

• National Airports Corporation v. Teodoro (91 Phil. 203) — Controlling precedent establishing that airport management and operation are proprietary functions; followed and reaffirmed.
• Civil Aeronautics Administration v. Court of Appeals (167 SCRA 28) — Reaffirmed Teodoro and held that the CAA (predecessor of ATO) was not immune from suit as it performed proprietary functions.
• Kawananakoa v. Polyblank (205 US 349) — Source of the theoretical basis for sovereign immunity (Holmes, J.).
• Providence Washington Insurance Co. v. Republic of the Philippines (29 SCRA 598) — Cited for the practical justification of sovereign immunity (preventing obstruction of government service).
• De los Santos v. Intermediate Appellate Court (223 SCRA 11) — Held that sovereign immunity cannot be used to avoid payment for property taken without just compensation.
• Malong v. Philippine National Railways (138 SCRA 63) — Held that PNR, though government-owned, was not immune as it exercised proprietary functions.

• Article XVI, Section 3, 1987 Constitution — "The State may not be sued without its consent." Basis for the doctrine of sovereign immunity.
• Republic Act No. 776 (Civil Aeronautics Act of the Philippines), Section 32(24) and (25) — Granted the CAA (and by succession, the ATO) powers to administer, operate, and manage airports and to collect fees, establishing the proprietary nature of these functions.
• Republic Act No. 9497 (Civil Aviation Authority Act of 2008), Sections 4, 23, and 85 — Abolished the ATO and created the CAAP with explicit corporate powers, including the power to sue and be sued, and transferred all ATO assets, rights, and obligations to the CAAP.
• Executive Order No. 365 — Reorganized the CAA and abolished the National Airports Corporation (precursor legislation retaining the same proprietary functions).
• Proclamation No. 1358 — Presidential reservation of land for airport use (raised by ATO as basis for immunity but rejected by the SC).

• N/A (Brion, Abad, Villarama, Jr., and Sereno, JJ., concurred without separate opinions).