Just a quick question.
Is there any destinations there is better to unlock than other?
And which airplanes is the best to unluck?
I’m in Prague airport now, I think I have a fine understanding of the game but these two questions, am I not sure about 
Depand, for what you aiming.
L A332 and M E190, fast to handling, M B757, B777 and A380 have more passengers, what better to farm passengers.
Shortest destination bring more money from your own planes, the longest help you less to log in in game and make your plane gofaster to C maintance.
If you play often, and can send plane, it takes near 35 +/- day’s to make you aircraft from 0NM to D maintance and get your’s golden plane’s.