Actually they are unidentified according to the USN. As to whether they come from outer space? Is is possible, yes. I would wager if you want to go the non-earthling route the critters would be inter-dimensional more than anything.
All that being said if they are experimental craft they have to have anti-gravity capabilities to do the maneuvers they were doing. This totally destroys Boeing/Airbus etc... and other conventional airline and space technology, making it akin to the horse and buggy and a top of the line Porsche. If they are make public why would you spend another penny on a 767, F35 or SLS booster?
Anti inertia ... 90 degree turns at over three thousamd mph is normally a killer. Yet ‘they’ do it.
If a non-earthling existed we wouldn’t be here.