Make a monument where you have to use a red card to access the roof which spawns a minicopter on a heli-pad.
This roof should not be boostable, and have an active sam-site that can be de-activated using a switch for a short period of time so the player can fly away with the freshly spawned minicopter.
Similar to the snowmobile spawning system, but more high tier and is protected by a sam-site to prevent free minicopters.
Perhaps launch site after they introduce scientist on them.