make a plane take off after 20 minutes?

[Commando]

Im making a coop mission where 3 agents have to flee from a island. And their objective is to reach the plane that is civilian controlled get in cargo and get off the island. But i don't got a clue how to make the plane start off after a certain time..if I don't get help i think I must have a pilot that will have to start far off and walk or whatever to the airport and then get inside the plane problems will be to make himtake off properly to because im using a big civi plane addon like 747 or something
but any help would be apreaciated and I will most likely post the mission on ofpec when its done

[Black_Feather]

use

this setfuel 0

in the planes init field, and make a trigger and put

true

in its condition field, and with this in each of the countdown fields

1200

and on its on activation field put

planename setfuel 1

and it should take off, will probably work in mp but I've never made a mission so I'm not certain  

[Commando]

thx black feather! I have to try it on friday when i get home.
No im to tired to stay up..