Right, which is why it "weighs" more and starts to make sense for a flying vehicle to store more of it as gas (less weight, more ballast) and the more you store

Right, which is why it "weighs" more and starts to make sense for a flying vehicle to store more of it as gas (less weight, more ballast) and the more you store as gas the closer you get to reinventing airships/blimps/zeppelins.