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Good point, higher utilization is one of Southwest's key competitive advantages since they're able to squeeze 1 extra trip for their aircraft than competitors.

Significantly cutting travel time should also enable higher utilization. E.g. cutting LA-Sydney route in half (15hrs to 7hrs) theoretically enables fitting in a roundtrip in the timespan of a one-way.

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By utilization I actually meant the percentage of filled seats but yes that's also an advantage of supersonic planes. You need roughly half as many planes to service the same timetable (assuming turn around is roughly as fast and doesn't get drawn out by technical/maintenance requirements).

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