Problem with take-off in formation

[marcastel57]

I created a couple of missions with six bombers taking off in scramble. When I test them with the AI in control, everything works fine: the aircrafts take off by pairs and join formation after a while, following all the assigned waypoints. But when I play, the others follow me only after a time and they fly round and round if I wait for them at height or if I go my way to the target. Is there any option or command to have them in my tail at take-off?