how do planes stay up in the air?

Question: how do planes stay up in the air?
- Keywords:
  air,
  plane
Asked by mak2016 to Reka, Kuntal, Kate, Ajay on 14 Nov 2016.
- Reka Nagy answered on 14 Nov 2016:
  
  They use powerful engines that move air above and below the wing at different speeds. The wings push air downwards, generating lift to counteract gravity.

Question: how do planes stay up in the air?