Are you kidding me? An airport is the last place I'd want to work. Expensive and crappy food, tired and annoyed people, and the endless noise of foot-traffic and zooming carts and loud-speaker announcements make airports one of the worst places on planet Earth.
Only partially. Maybe Airports would not make a good fit, but I'm positive trains would. Or at least the fairly comfortable high-speed rail we have over here in Europe.
That would make for some seriously expensive coffee, at least between flights. Airports aren't, at least in my experience, exactly known for their competetive pricing on food and beverages.
Yeah, I get a lot of work done in airport lounges. I think it's because there's a feeling of having a deadline (the plane leaves in an hour), and there is a feeling of having no obligation to do anything (you're in an airport, for cryin-out-loud). Combined with flaky 3g-dongle internets that makes web surfing a pain, it ends up being very productive for me.
(I have thought about structuring an office like an airport lounge. Comfy chairs, snacks, and people walking around asking you if you want them to bring you coffee. Yes, please!)