Basically onboard the prydwen there is a new boardable vertibird with a full crew and upon getting in, it will fly around and patrol the skies randomly and behave like other vertibird I.e circling etc. you can command it to take you where you want to go normally (great if taking damage) but instead of landing it will resume to fly around ((making sky patrols cool as hell and even has all the AI)) but you can still press X to drop you off. Best thing about it is that it is possible for it to be shot down. You may die but power armour greatly increases your survival chance. Any surviving crews will deal with enemies in the area then travel around in a group searching for AI unlike vanilla where they patrol same areas then stop. New item is a sensory flight helmet that gives night vision which is toggleable and reveals any enemies on the group in a blip ((because sometimes they aren't visible due to bad loading, I only see the beams etc))
Missions BOS part 2 of the idea is essentially being able to do all the same missions as in vanilla research patrols, clearing out areas etc except you aren't the leader. You follow the AI who have a pre set destination and path sometimes outside and sometimes inside. You can clear entire dungeons etc in a squad of BOS. You can even stimpax then if they low health. It's nice to follow instead of following for a change. I imagine survival mode this be amazing.
Oh and upon reaching rank of Sentinal you have the ability to fly them.