Cabin altitude is the pressure the cabin is held at in the cruise, not the height of the aircraft. On older airframes that figure sits near 8 000 feet — roughly Aspen — for the whole flight.

Newer long-range cabins hold closer to 3 900 feet. On a fourteen-hour sector that is measurably less fatigue, less dehydration and a clearer head at the far end.

It is the single specification we point clients to first when the trip is overnight and the meeting is the same morning. Range gets the attention; pressure decides how the day goes.