The Philippines stands at a critical juncture in its aviation infrastructure development. Manila’s Ninoy Aquino International Airport, the nation’s primary gateway handling an unprecedented 50.1 million passengers in 2024, operates in a state of chronic congestion that threatens the country’s economic competitiveness and tourism potential (New NAIA Infrastructure Corporation, 2024). The airport’s current predicament—serving 15 million passengers beyond its designed capacity of 35 million annually—demands bold, transformative solutions that go beyond incremental improvements (Wikipedia, Ninoy Aquino International Airport, 2025).
The proposal for an integrated subway system connecting NAIA’s terminals with a new Gateway Terminal at the Parañaque Integrated Terminal Exchange represents the definitive solution to airport decongestion. This underground railway network would fundamentally address the airport’s most pressing operational challenges while creating unprecedented opportunities for passenger flow optimization and
traffic reduction throughout Metro Manila.
The Underground Railway: A Revolutionary Approach to Airport Decongestion
Currently, NAIA’s three operational terminals exist as isolated islands separated by distances of up to 4.8 kilometers, with Terminal 1 to Terminal 3 spanning approximately 4 miles or 6.4 kilometers, creating massive congestion as passengers rely on shuttle buses, taxis, and private vehicles for inter-terminal transfers (Manila Airport Guide, 2024; Rome2Rio Terminal Distance Analysis, 2024). This fragmented
system forces an estimated 50,000 daily inter-terminal movements onto already congested surface roads, contributing significantly to the traffic gridlock surrounding the airport complex.
The proposed underground railway system would eliminate this surface-level congestion entirely. With an estimated cost of ₱320.68 billion for the complete subway integration system, including ₱65.45 billion for inter-terminal connectivity based on Metro Manila Subway construction costs of ₱10.78 billion per kilometer, the project would transform passenger movement from a traffic-generating burden into a seamless underground operation (Metro Manila Subway Wikipedia, 2025; DOTr Infrastructure Cost Analysis, 2024). The estimated travel time of just 8 minutes between the furthest terminals—down from the current 45-minute surface journey that can extend to over an hour during peak traffic—would remove thousands of vehicles from airport approach roads daily, delivering immediate decongestion benefits (Philippines Travel Guide NAIA Transfer Times, 2024; UBE Express Route Analysis, 2024).
The underground approach offers unique advantages that surface transportation cannot match. By operating below ground, the system eliminates weather-related disruptions, traffic interference, and the need for additional surface infrastructure that would further congest the already strained airport vicinity. The climate-controlled environment ensures consistent service regardless of Manila’s challenging weather conditions, while the dedicated right-of-way guarantees reliable transfer times that surface transportation simply cannot provide.
Following the successful Hong Kong MTR model, the NAIA subway stations would integrate limited commercial businesses within the underground concourses, creating additional revenue streams while enhancing passenger experience. These commercial spaces—including dining establishments, retail outlets, convenience stores, and duty-free extensions—would be seamlessly connected to terminal
buildings through climate-controlled walkalators, ensuring effortless passenger movement between transportation and commercial areas. The estimated revenue from these integrated commercial spaces could generate an additional ₱3-5 billion annually based on Hong Kong MTR’s commercial revenue model of approximately 20-25% of total system revenue, further strengthening the project’s financial
sustainability while transforming the traditionally sterile airport transfer experience into a vibrant commercial corridor that rivals the world’s most advanced airport systems (Hong Kong MTR Corporation Annual Report, 2023; Singapore Changi Airport Commercial Revenue Analysis, 2024).
The Gateway Terminal: Revolutionary Decongestion Through Distributed Processing
Perhaps the most transformative aspect of this proposal lies in the creation of a centralized Gateway Terminal adjacent to PITX, designed to handle an estimated 25,000 passengers per hour through dedicated immigration and customs processing, with construction costs estimated at ₱110 billion for a 150,000 square meter facility (Gateway Terminal Technical Specifications, 2024). This facility represents a paradigm shift in airport operations—moving passenger processing away from congested terminal buildings to a purpose-built facility with superior access to Metro Manila’s transportation network.
The Gateway Terminal concept addresses congestion at multiple levels simultaneously. By processing international passengers at a dedicated facility connected to PITX, the system would eliminate the bottlenecks currently choking NAIA’s immigration halls. International passengers would complete their entry procedures at the Gateway Terminal and gain immediate access to Metro Manila’s comprehensive public transportation network, bypassing the notorious traffic congestion surrounding the airport entirely.
The integrated subway system’s commercial development potential extends beyond basic transportation, incorporating Hong Kong’s proven station-retail model that transforms underground spaces into thriving commercial hubs. The walkalator- connected commercial corridors between subway stations and terminals would house carefully curated businesses—from international brands and local retailers to premium dining establishments and specialized travel services. This integration would create a seamless passenger journey where travelers can shop, dine, and conduct business while moving between terminals, generating substantial additional revenue while reducing the perceived travel time through engaging commercial experiences.
The facility’s integration with PITX, which accommodates up to 200,000 passengers daily with direct LRT-1 connectivity, creates unprecedented decongestion possibilities (Parañaque Integrated Terminal Exchange, Wikipedia, 2025). Rather than funneling all airport passengers through the same congested access roads, the Gateway Terminal would distribute passenger flows across Metro Manila’s existing transportation infrastructure, dramatically reducing pressure on traditional airport approaches.
Strategic Point-to-Point Bus Network: Dispersing Traffic Across Metro Manila
The Gateway Terminal’s connection to PITX’s extensive point-to-point bus network represents a crucial element in the overall decongestion strategy. PITX currently operates comprehensive bus services to five key areas that would serve as major traffic distribution points for airport passengers:
Bonifacio Global City (BGC) via Buendia: Direct express service to Metro Manila’s premier business district, removing an estimated 15,000 daily passenger trips from traditional airport taxi and private vehicle routes, with journey times of approximately 45-60 minutes (PITX Transport Routes, 2025; PITX City Bus Routes Analysis, 2025). This route serves the high-density employment centers that generate significant airport traffic.
Alabang via Zapote Road: Strategic connection to Southern Metro Manila’s commercial hub, providing seamless access to Muntinlupa’s business centers and residential areas while bypassing congested EDSA corridors, with travel times of 30-45 minutes (PITX Route Information, 2024; Metro Manila Bus Route Guide, 2023). This route would capture passengers bound for the rapidly growing southern suburbs.
North EDSA via C5: Direct service to Quezon City’s major commercial districts, including SM North EDSA and surrounding business centers, eliminating the need for passengers to traverse central Manila’s congested arteries, with journey times of 60-90 minutes depending on traffic conditions (PITX City Bus Routes, 2025; Metro Manila Transportation Analysis, 2024). This connection serves the northern
employment and residential corridors.
Fairview via East Avenue: Express connection to northern Quezon City’s fastest-growing residential and commercial areas, providing airport access that completely avoids Metro Manila’s central congestion zones, with travel distances of approximately 35-40 kilometers (Transport Routes PITX, 2025; Quezon City Transportation Study, 2024). This route targets the expanding northern suburban population.
EDSA Carousel Integration: Direct connection to Metro Manila’s primary mass transit spine, enabling passengers to access the entire metropolitan rail and bus network without contributing to surface traffic congestion (PITX Terminal Guide, 2024). This integration creates multiplier effects for decongestion throughout the region.
These point-to-point connections would distribute an estimated 30,000-40,000 daily airport passengers directly to their final destinations without requiring transfers through Manila’s congested central districts, based on PITX’s current capacity of 100,000-200,000 daily passengers and projected airport passenger distribution patterns (PITX Terminal Capacity Analysis, 2024; NAIA Passenger Flow Study, 2024). The cumulative traffic reduction effect would extend far beyond the airport vicinity, creating system-wide improvements in metropolitan mobility.
End of Part 1
(This paper reflects the author’s independent analysis based on personal research. Additional studies and comprehensive feasibility assessments are recommended to validate the financial estimates presented in this proposal)
(Paul Chua, PhD, holds full doctoral degrees in Fiscal Management and Peace and Security, as well as a Master’s in National Security Administration. He has completed executive programs in several countries, specializing in transport, migration, urban planning, and public policy, with emphasis on governance, innovation, and integrity)
Originally published by The Daily Chronicle.