Singapore Changi Airport is one of the most modern airports that I have been to. Changi, the world's 18th busiest airport by passenger traffic, was first constructed in 1975. Serving 96 airlines flying to 200 destinations around the world, it handled 42 million passengers in 2010.
Changi has three main terminals, plus one dedicated to low-cost carriers, and another for "commercially important persons." Terminal 3 is the largest and the most modern looking.
Terminals 1,2 and 3 are connected via the Skytrain, a free light rail system. The a line of the Singapore MRT also terminates at the Terminal 3 station. The Budget Terminal can be accessed thru free shuttle buses plying between it and the other terminals.
Philippine carriers that fly to Changi include Philippine Airlines (disembarks at Terminal 2), Cebu Pacific, AirPhilippines, and SEAir (all at Budget Terminal). Budget carrier Tiger Airways, the one I took, also flies direct from Manila (NAIA 1 terminal) to Singapore.
pics, from top: Terminal 3 transit area; the airport as seen from my taxiing plane; the Skytrain