If the changes go ahead it could mean:
- Less noise for residents as aircraft climb higher and more quickly on take-off
- Planes would also stay higher for longer when landing
- Changes could reduce the need for so much stacking - where planes circle while waiting for a landing slot
- They could also put more routes over the sea where possible
- It could also mean fewer aircraft CO2 emissions and fuel savings for airlines
More top news
The head of an international drug gang, which hid cocaine in children's presents, has been jailed for 15 years.
It's being called London's first modern contemporary art walk. And it begins today.
Police are attempting to find a vulnerable missing 16-year-old girl who is feared to be with a 51-year-old man.