Here are a couple shows about airports that will be shown in the next few days:
Extreme Machines - "O'Hare Airport"
Discovery Science Channel, Fri Apr 15 10:00pm EDT
Megastructures - "Kansai Airport"
National Geographic Channel, Sun Apr 17 05:00pm EDT
Extreme Engineering - "Building Hong Kong's Airport"
Discovery Channel, Wed Apr 20 10:00pm EDT
World Tour - "International Airports"
History International Channel, Fri Apr 22 01:00pm EDT
Heathrow 24/7 - Part One
Discovery Times Channel, Tue Apr 19 08:00pm EDT
All of these shows repeats several times so check your listings if you miss one. All of these channels are available on DirecTV.