Does it make sense to keep class 1 airports open with few airplanes?

I'm about level 17 or so on Pocket Planes, and I have been mostly opening class 2 and 3 airports now that I can afford to. I'm noticing that I have a ton of jobs now that I can't fulfill; I only have 11 airplanes. Does it make sense to keep class 1 airports open, if they're just going to generate jobs I can't fulfill? I can make more money with larger airplanes going to/from the larger airports anyway.

Of course, some of them would remain open as waypoints between cities so that the smaller planes can still fly from city to city.

Solution 1:

No, it does not make sense to keep those class 1 airports open. The jobs that are allocated are distributed across all the airports you have, so by closing the class 1 airports more of your jobs will be to class 2 and 3 destinations that are easier to combine and make use of your current fleet.

Keeping a couple of class 1 airports open as waypoints is reasonable, but for more efficiently generating income it's best to just have class 3 airports, upgraded to have the most layovers (and jobs) appearing and have them spaced at the range of your class 3 aircraft.