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I only have mayo on my hot dogs. Though I think our mayo in the uk is a bit different to how it is in the US. :D
I think you've too many airports. Start closing some of the class one airports, use the money to buy class two/three.
Since I'm based in Europe, time to hit Casablanca up :D
Hah hah, I'm delivering a tiny tower to Venice :D
I just go with whatever takes my fancy, still I'm still quite early in the game. Gotta admit a lot of them have an Ironman-inspired colour scheme...
If you've a knack for planning and micromanaging, I think so. I lack those skills though, so I just do it if the chance presents itself XD
Think of it like real life layovers. You ditch the passenger(s)/cargo at one airport, and pick it up with a different plane. It's useful for...
When the plane's not in use, you can send it to the hangar and from there sell it.