Over on the TKO2 server we have a map running called
Dawn at Hawk Hill (available on the ). There is a Chinook on auto-pilot that flies over head every few minutes. The USA can spawn inside of it (but not enter it) and have the option of when they'd like to bail out. If the chopper goes out of bounds it explodes. The cool thing is that if someone is inside of it while it's going out of bounds... it doesn't explode. Basically it waits for the players inside of it to die and THEN it explodes, lol.
If you want to take a look at the code simply download the file and open it up with with winRFA. The added .CON file for it should be at the top.

P.S. Do NOT use heat-seekers on a map using this code. If a seeker is fired it will target the Chinook and immediately crash. To get around this we simply removed the SA-7 kits from the map.