May 2, 200818 yr Author You bet. The most economical speed is so called Long Range Cruise (LRC). You can find this speed for a given 747 and for Cessna 172 (by the way it changes when aircraft burns fuel and becomes lighter). The higher cost of fuel the closer everyone will follow this speed.Michael J.http://img142.imageshack.us/img142/9320/apollo17vf7.jpg Michael J.
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