it seems to be common to leave the Junkers filled with one person and then hope to survive the anti-aircraft, well, i have here a way to spare you from that, its quite simple, and not a bug or something, to start
1. take a Junkers 52 (the big green planes with three propellors)
2. load up on people
3. start flying, and point your nose up in 45 degrees
4. after takeoff, switch to 3d person view (f10)
5. when the water is about 3 centimeters of your screen, make the angle about 15 degrees, and fly along the non-combattant area border
6. when the sea/ land isnt visible anymore to you, you might think your safe, you arent...
7. fly inland still with the angle of 15 degrees
8. let passengers now to NOT JUMP
9. on your sign you should tell them to jump.