[mansonh]

So it sounds like you want to script this yourself (alternatively ask in the script request thread)

I assume you have gone to
http://forum.sa-mp.com/index.php?topic=2750.0
and
https://sampwiki.blast.hk/wiki/Main_Page

For what you want specifically:
This is quite a lot to script.
You have to get the airport coordinates, get their areas, setup a check for player in plane, and write commands.

Give it a try and see how far you get. If you get stuck I can help you out, but I don't have time to script all that atm.

To get you started you will need to learn either the regular command system, or something better like dcmd.
https://sampwiki.blast.hk/wiki/OnPlayerCommandText
https://sampwiki.blast.hk/wiki/Fast_Commands#dcmd
http://forum.sa-mp.com/index.php?topic=75000.0