This is ONE of the things I've been working on lately!
There will be another version of this plane, with more detail, and other cargo.

Specs:

Stall speed: ~170 mph
Max speed: ~360 mph
Car max speed: ~205 mph

Controls:

Ag1 - navigation lights
Ag2 - landing lights
Ag3 - open cargo door
Ag4 - Controls of the car(roll steering, pitch forward/backwards)
Ag5 - Magnets under the car
Ag6 - Parachutes car
VTOL up - Flaps
Brake - spoilers

Loading the car:

First of, press Ag3
Then press Ag4 and drive the car into the plane, and drive till the very front.
As soon as you’re in the plane, press Ag5, make sure it sticks.
Press Ag3 and 5 again and you are ready to go!

Flight:

Take-Off: Flaps 3/4
Landing: Full flaps.

Release cargo:

Press Ag3, then flaps 3/4, and deactivate ag5.
before hitting the ground, don't forget to press Ag6

It took me 5 days to build this, so i hope it deserves your upvote!