Birchcrafts have the range to do New York - LAX. As you get higher in levels I would start to acquire more of the class 2 airports (blue) and class 3 (red). At my midpoint I had LAX, PHX, DFW, ATL, MIA, Washington, Boston, and NYC. As I've shifted to longer range flying I've killed almost all of them off (minus Honolulu) in favour of class 3 airports.
Also when you get the cash upgrade your class 3 airports to the maximum so as to get more jobs and allow 60 layovers.
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