how can planes fly if they weigh so much

Question: how can planes fly if they weigh so much
- Keywords:
  fly,
  plane,
  weight
Asked by alf to Monique on 12 Nov 2015.
- Monique Henson answered on 12 Nov 2015:
  
  That’s a great question! They use the principle of lift. Essentially, if you take a sheet of metal (like the wing on a plane), and shape it in a very particular way, then when air flows over it, it will cause the sheet to move up in the air.
  
  Why does it move up in the air? Wings on a aeroplane are curved on the top, but flat on the bottom. When air travels over the top of the surface it travels further than the air that travels under the bottom. It also travels faster, and fast moving air is at a lower pressure than slower moving air. That means there’s a difference in pressure between the air at the top and the air at the bottom. This pressure difference causes the wings to lift up.
  
  There’s a bit more information on this website here. Hope this helps!

Question: how can planes fly if they weigh so much