I've heard that Boeing 747 airplanes have enough lift to fly properly (if not land properly) with their fuselages full of water. They are in service as fuel ta

I've heard that Boeing 747 airplanes have enough lift to fly properly (if not land properly) with their fuselages full of water. They are in service as fuel tankers. Still, it's a bad idea to prang an airplane with a few hundred people in the aisles, so pilot skill is important.