Soooo....based on the scant data on the most recent (2nd) object in the sky over Alaska, if it is about the size of a car, and shaped like a pop can, the volume of the craft, if filled with helium can only lift 100 pounds. If it’s not helium filled, there is no way a cylindrical object with that general shape, using tradition propulsion system, can maintain 40,000 feet. It is a puzzlement.