ey - you've moved here with your question
anywayz, in your case it should be easy to solve:
?vehicle player == cessna1: goto "takeoff"
This is the only thing you need to change in your script, and
everything should be fine.
player returns only the local player on each client,
so it will only run there, where the player is inside the cessna1
cop1 will be the unit cop1 on each client, but players are there
only one per client
~S~ CD