My airports are dramatically losing me money - any tips?

[DeadSimple365]

Thanks

[Lmallet]

Airplanes have high maintenance fees.  They need to be pretty much full at all times in order to make money.

[IgorEliezer]

Connect most of airports to other heavy means of transportation.

[VictorKoehler]

The planes are very expensive, and as in all vehicles, cost has to walk, or you have to build
various airports, connects them with the city, and choose airplanes that do not cost much use has been square.
Sorry for the language, my translator is not good. Try
understand a little.  

[DeadSimple365]

Thanks guys