Love the sim. I have 15 hours in to it so far. I've noticed some things while playing, and two of them are game breaking, see #1 and #2
All of these are for the Philadelphia Airport.
1) Sometimes planes will not push back because the pusher is missing, (Have to delete craft)
2) After an hour or two of game time, arriving flights stop pathing to the terminal, and you cannot tell them to taxi, the only choice is to delete them
3) Sometimes, aircraft that flare on arrival, never straighten out and stay in a state of flare, dragging their rear on the ground forever. (All airports, usually twin prop planes)
4) Pusher vehicles can be seen far away from where they belong, like along a runway and seem stuck there.
5) Arriving flights sometimes will reach it's terminal and just spin around in circles, never actually completing it's flight and needs to be deleted to clear it.
It would be nice that if you have an aircraft selected, that the choices change depending on what it's doing. For instance, telling a plane "clear to takeoff", after re-selecting that plane and watching it take off, the choices should change, like "Contact departure" should pop up upon take off without having to click on the plane again after take off. Not a game breaker, but it would be nice. Kind of like context sensitive choices given depending on what the craft is doing at that moment without having to re-select it.