And don't forget:
17) A very nice pilot who says "Good morning" before going out on patrol towards the backyard.
18) A complete set of "Magic Hands" to scratch your back as you please.
19) Some crewmen to help waxing the so typically scratched plastic of most DX.
20) Some sunscreen lotion with UV filter to prevent yellowing.
21) A service ceiling of at least 30,000 feet.
22) A complete set of spare parts for repairs (made by the aforementioned crew)
23) Pilots in at least ten different positions, or only one but make it fully articulated.
I've got some other ideas but they'd be more suitable for a 1/48 scale.