Delayed action?

[marcastel57]

The idea is to build a ground strafing mission, with fighter bombers attacking an airfield and defending AI fighters scrambling just while bombs begin to fall. In order to do this, I thought to use a "TPassThrough" trigger setting the range limit very close to the target, but in this way there should be an unpleasant effect of "materialization" of defenders seen from the raider's cockpit. So I wonder if there is any way to delay the action of the defending group, so that they can spawn on the runway at the "click" of the trigger, but take off only after a time to define; in this way I could set the trigger range farther.