UAP is no different than UFO, both simply mean that you are looking at something moving in the sky and don't know what it is. Neither is synonymous with an Alien Spaceship. The government just could NOT use UFO to describe what they were speaking about so they "invented" a new word grouping that means the same thing...UAP...
We see a lot of things in the sky that we can't positively identify. Technically these are all UFO/UAP. They might be anything, plane, blimp, falling star, orbiting object... Somehow UFO and UAP have become the words specifically used to infer that these unknown things in our skies are of alien construction.
Until one of these aliens decides to land on the White House lawn and comes out saying, "Take me to your leader please." I will assume that the great majority of the sightings are either misinterpreted sightings of terrestrial origins, some sort of natural phenomenon, or some sort of secret new human-designed flying device. NOTE, this applies to the great majority! It is that tiny number that just can't be explained with normal phenomenon descriptions that gives me a headache thinking about it. Why would interstellar visitors all be so shy? Do they fear us or are they protective of us somehow? Based on the many different descriptions of both the ships and their crews IF these are of alien nature there must be a lot of them from many different places visiting the zoo we call home to peek at the monkeys!