oR.. HRMM.... try this: set all the choppers on a line, place the WP's like this:(CH is the blackhawk, the CH2 and 3 are Cobras)
CH----O---O
CH2---O---O
CH3---O---O
Place one trigger, GROUP the trigger with CH(1), place the trigger over the second WP (the middel O) with a radius 20-30 (as desired) set the settings for the trigger "Vehicle, In Area" (do not type anything in the ExpAct or Cond). errrr... I'm not thinking clear now, but try to synchronize the trigger with the two waypoints of the Cobras. I'm not sure if this is what I'm thinking of, but you should get the idea if you just try it sometimes. Make sure the Cobras are closer to the wps than the blackhawk. So in mymind, the cobras will wait for the blackhawk until the blackhawk arrives in the trigger.... any1 understand?
Henning