Does anyone know of an online website that shows the 4-letters airport codes...the ones used by pilots and such rather than the three-letter ones used by reservations, FlyerTalkers, etc.?
Most if not all US airport just convert by adding a K I think
EWR --> KEWR
International ones change entirely...the following I know off hand...
AMS --> EHAM
NRT --> RJAA
HKG --> VHHH