You can see from the photos how people might mistake planes for drones or UAP's.
People aren't getting airplanes confused with drones because they look the same. People are getting worked up about drones because of collective paranoia, and then they are seeing what they want to see.
First, I believe that this term has been introduced by the us government, so it’s not the crackpots laundering the conspiracy themselves by using a new term.
Second, I believe the reason UAP was introduced is to describe properly recorded and credibly witnessed and described phenomena (tic-tac, etc) that are not explained by any publically known craft, engineering, or science, but aren’t likely aliens either; and that is well described by UAP which doesn’t directly imply aliens that ufo does.