> 747 A 747 can’t stay in the air indefinitely. An airship can refuel and resupply without the owner even being aware. He can park it 5 miles off the coast an

> 747 A 747 can’t stay in the air indefinitely. An airship can refuel and resupply without the owner even being aware. He can park it 5 miles off the coast and stay there forever. A 747 can’t do this.