Fuel is bigger. A 4-engine 747 is thirsty. It's a big reason why the A380 fizzled out as a program. The era of the very large plane is pretty much over, as lon

Fuel is bigger. A 4-engine 747 is thirsty. It's a big reason why the A380 fizzled out as a program. The era of the very large plane is pretty much over, as long as it has more than two engines. --- Labor is not a particularly large cost, especially if you are in a country that has access to cheaper labor.