Game allows route creation without owning gates

I have created a few routes (some in error, 1 to duplicate to test) and it doesn't bounce me for gate leasing if I try to create a flight owning no gates (see CGH-AQP and CGH-COR).

The game does return an error for some. I think this is domestic flights it returns the error and international flights it allows you to create.

Nice little bonus for those of us not based at LHR, CDG, HND, or ORD, ATL