You might be interested in the aircraft rules I've been using:
These rules are for using fixed wing aircraft who undertake a straffing or bombing run to release their payload. Aircraft will arrive on a table edge and have a couple of turns in play before flying off to return on the next turn.
Aircraft use their first action to deploy on any square on any table edge. This counts as a Move action as normal.
The speed indicated of the aircraft card is it’s minimum speed. The aircraft must move forward at least this distance as a Move action for it’s first action of a each turn after deploying. For every 3 squares it moves forward it can move 1 to the left or right, this does not count as part of its minimum move. Aircraft cannot turn or change facing. If an aircraft leaves the table it can return for another run next turn.
Aircraft with guns or rockets can only shoot at targets directly in a straight line in front of the cockpit. Targets get a cover save if they are adjacent to terrain separating them from the shooter.
Bombs can only target units that the plane has passed over.
Aircraft is ideally based on a tripod so that it can straddle any terrain or unit easily as neither have any effect on the aircrafts movement. The tripod covers one square, regardless of the size of the model, all attacks to and from the aircraft are taken from this square.