FormationFlyer
Ok. Rules of the air Rule 11. Requires the anti-coll for flight at night. However, it says flight. Therefore technically until you line up on the runway you arent in flight.
I think you will find for the purpose of the ANO flight actually means in the case of a piloted flying machine, from the moment when, after the embarkation of its crew for the purpose of taking off, it first moves under its own power until the moment when it next comes to rest after landing.