|Quoting F.pier (Thread starter):|
Is the captain to ask the FL he likes or is the control tower to tell him the FL to reach?
The captain, with the knowledge of his/her aircraft weight and performance, plus the winds aloft, plus the temperature will ask for a flight level that would make the flight optimum.
btw, the control tower is just for airport movements. After the initial climb, we generally communicate with an en-route center.
Their aircraft are in general lighter than those of an established airline : light seats, minimum galleys...then very little luggage and no post or cargo. All these parameters allow for a higher altitude capability.
Finally, on a short flight, theory shows that the minimum fuel burn is for the shortest time in cruise so that the profile is closest to a straight climb immediately followed by a straight descent. Then your answer will be that they optimise their flights as much as possible for fuel economy reasons.
Hope this helps.