Most events don't need a departure and/or arrival airport defined at all. The only exception I can think of is ONE_WAY. Might as well make it optional, just like we did with the Flight model back in #115 / v.2.1.0.
Also, this would better support changes from #400 / v5.2.0.
Most events don't need a departure and/or arrival airport defined at all. The only exception I can think of is
ONE_WAY. Might as well make it optional, just like we did with theFlightmodel back in #115 /v.2.1.0.Also, this would better support changes from #400 /
v5.2.0.