Flight Deck Manager Trait ID
The gain_xp trait ID for Flight Deck Manager in Hearts of Iron IV is flight_deck_manager.
Flight Deck Manager
NavyAssignable Trait
Grant this trait to your selected commander with the gain_xp command and the trait ID flight_deck_manager.
About this trait
Launching a plane from the deck of a ship is fairly simple. It's launching the other two dozen at the same time that's the problem.