No, they typically fly at the most profitable speeds within the constraints of the flight and airspace parameters. Which results designing the planes to be effi

No, they typically fly at the most profitable speeds within the constraints of the flight and airspace parameters. Which results designing the planes to be efficient at those speeds. https://www.boeing.com/commercial/aeromagazine/articles/qtr_4_07/article_05_1.html https://www.boeing.com/commercial/aeromagazine/articles/qtr_...