4. The TWA Flight Center
Though most of the Jet Age terminals at JFK Airport have been demolished, The TWA Flight Center still stands and is viewable from the AirTrain between the stops for Terminal 4 and Terminal 5. The original view of the Flight Center out to the tarmac has been obstructed by the Jet Blue Terminals but the view of the front of the Eero Saarinen-designed terminal from the AirTrain is pretty great.
Currently, MCR Development is repurposing the landmarked TWA Flight Center into a 505 room hotel, with the guest rooms in two newly built buildings surrounding the original structure which will be used as a lobby and hospitality spaces. Though the TWA Flight Center has only been open on rare occasions in the last decade, the new hotel will make this landmark publicly accessible again.