//Aircraft>AircraftScript.set_EvadeLockProbability is probably the best way to delay detection.
Finished commands should look something like this:

//Aircraft>AircraftScript.set_EvadeLockProbability 90 
//Aircraft>AircraftScript.set_EvadeLockProbability 95
//Aircraft>AircraftScript.set_EvadeLockProbability 100 (Unlockable)