The airline usually run a flight plan based on their desired cost index, taking into account all the usual reasons re: fuel availablity, schedule, winds, weight etc.
It is upto the flight crew (captain) to actually fly the aircraft, however, and can adjust the aircraft's speed as they see fit. The airline will usually provide guidelines as to how they would like the aircraft operated, and the crew will stick to that unless they have a good reason to do otherwise.
The pilot always retains the final say.
Last edited by Owen H; 8th May 2009 at 02:03 PM.
Reason: Spelling
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