Total travel time.
Understanding all the posts about fuel efficiency vs speed.
Although you can cut airtime by approx 10% (flying 95% the speed of sound vs 85%), this only adds minutes to short flights and maybe an hour to a long flight.
But, you still have the overall time sink of the drive time + arrive 1 hr early + waiting to deplane/get baggage + drive again to your final destination.
People would rather save $40-$200 and accept the 85% speed of sound savings.
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