These codes were multiplied by distance to obtain an additional variable which improved the regression significantly. Perhaps our attempts along these lines are not based on a detailed enough knowledge of airline operations. While we do not give the data here, we do show a their scatterplot and a portion of the printout from doing the regression of travel time on distance. Try making your own dataset of airline schedules. Printed system schedules of major airlines are readily available free of charge.
Most schedules give mileages between airports.
Copyright 1996 by Bruce Trumbo. All rights reserved. This is similar to problems prepared under NSF grant USE-9150433.