To me it seems obvious that "avigation" should mean far more than just the right to overfly residential areas.
Finding a distant destination used to be an extremely challenging task. In WWII, a huge flight of Air Force bombers set out to destroy oil refinery at Ploesti, Roumania. There was cloud cover almost all the way. They missed the target by hundreds of miles, and many thousands of dollars were wasted. The Colonel in command of the flight was courtmartialed and lost rank and benefits. The cause was not discovered until long after the war - the now well known jetstream. Now GPS makes knowledge of position of aircraft constantly available with fantastic accuracy.
And detours around bad weather zones can be made with important savings in time and money, using information from
electronic communications. That's avigation.

The right to fly over an area is avigation easement rights, avigation itself is as you describe it, Dr Bill.