What would be the difference in time and fuel consumption for a flight that had no waiting in line for takeoff, no waypoints, and with a …

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Answer by Thomas Zerbarini:

In general, from your question (assuming a jet):

  • Immediate pushback, taxi and takeoff would save fuel (300 to 1000 lbs)
  • straight line navigation would be marginal in fuel savings. Almost a non-issue as long as the flight is general not turning more than 20 degrees. Long distance flight benefit from great circle route planning (the shortest distance route on a sphere).

  • A continuous descent would consume a lot of fuel. the best descent profile is a 4-5 degree descent angle and staying aloft at cruise for as long as possible. In this scenario you are essentially descending with idle thrust.

So, the best fuel savings scenario is"

  • No delay Taxi to takeoff
  • Best rate of climb to cruise
  • Stay aloft in cruise as long as possible
  • Fly straight and/or great circle routes for long distance.
  • Fast descent to landing.
  • No delay taxi to gate.

Thomas Zerbarini

What would be the difference in time and fuel consumption for a flight that had no waiting in line for takeoff, no waypoints, and with a …

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