[Mobhack]

Game Options -> Help Tab -> "Read the Game Manual" button.

Once the Game Guide is launched, press the "Artillery Bombardment" link. Scroll down to the description of the "switch to" button used to select the appropriate artillery type sub-page and its sub-paragraph on the "Airborne Page". Then scroll further down to the "Air Transports and Gliders" paragraph. See the tutorial section of the GG if you are unsure about how to plot artillery.

Basically - load them in the deployment turn (as the planes will be removed from the map on game start as described in the help - planes are off-map assets). Planes you don't load in the deployment phase will be unloaded. Then plot the mission as part of your pre-game bombardment (using the Bombardment Delay Adjustment (+) button to delay them if a later turn drop than turn 1 is required). Unplotted air transport missions will have an extremely long delay if called in on an impromptu basis. Use the switch to button to choose the appropriate artillery mission sub-page.

No "fixing" required.

Cheers
Andy