U.S. Air Force

Although it is not 'Easy' to add these features as you say, they are likely to be included in AE4.

That would be awesome. ^^ I'm not a code writer, so I can't speak on how easy to technically apply these features it would be. From a weather standpoint it would be a simplified system. I look forward to seeing that.

So I finally found the information I needed. I'll share in case anyone else needs. You can start a plane from anywhere you own gate. Once you assign an aircraft a route ( IE: KJFK - KSYR ) You can fly from either or those two gates within limits of gates available and hours on aircraft. So basically whatever route you first give an aircraft will determine what starting points it can fly from. Flying from one of the original two, you can add route legs. If you are still having route issues enter the following in forum search: Incompatible schedules   ...  That is where I found a lot of information on route mechanics.