The FAA Call Sign of AF1 has NOT been utilized since the morning of 1/20, when Trump flew from Andrews to FL. The aircraft that typically transport POTUS have flown since then, but ALWAYS have had FAA call signs of NA.OK. Start there. How do you know that is a fact?
Plus, it corroborates other aspects of POTUS - for example, the WH live cam shows that the WH goes pitch black at exactly 11 PM. Has done so EVERY night since 1/20. Watch it yourself tonight, it's on a 40 sec delay, so lights out
Another aspect to this - on 1/20, Trump flew to FL on "AF1", while Biden flew into DC on a private a/c. On departure at Andrews, Trump was given a 21-gun salute. Biden was given a 7 gun funeral-type salute.
There are plenty more.