I chose Airport because I used to work at one. I had hoped to work with the same team again, but my friends are victims of the merger mania and the economic downturn. The station, which was Fort Wayne's only major airport hub for many years, has been subsumed by another company. At least that company was staffed with good people also.
Also, at Airports, there is always something happening where you can't see, without clearance of course.