There are numerous jumps near vehicle fields and the tunnels. Fun. If you spawn a plane at a vehicle field (offline of course), you can even taxi the planes up and over them or use them as ski ramps for short takeoffs. Other bumps on the ground at vehicle fields can be used as jump ramps too.
Spawning an aircraft at some vehicle fields results in the plane being pointed at an obstacle like the big water tower. If you drive carefully, you can taxi the plane under the water towers. I had to go hard left to get under the tower before I could taxi around the vehicle field. Fun, more fun if the planes did not spawn pointed right at obstacles though.
