How do I cancel an aircrafts Return to Base (RTB) order?
Select the aircraft and hit the “Unassign Aircraft” hotkey (the “U”-key). After this point, the plane (or air group) is yours. It is moved into the unassigned list and will loiter until given further instructions. If the plane was landing because of fuel considerations (“BINGO”) it will still stop and await orders; it’s up to you to get it to a tanker or a base before it runs out of fuel.