A "Red Eye" flight is eastward flight that flies at night, departing in the evening and arriving in the morning, such that the passengers have very short time for sleep at night, and normally cannot sleep anyway because of cramped shorthaul seating.
Which red eye flights did Concorde fly?? With the speed, Concorde could cross a lot of time zones overnight! So, what about setting out to meet the Sun at a supersonic speed?
A real example of a subsonic Red Eye flight. A certain flight departs from Dublin at 00:45 or 1:15 depending on the weekday, and arrives at destination 3 hours of flying and 2 time zones later - 5:45 or 6:15 respectively. It is a Boeing 737-500, with relatively limited comfort (31 inches pitch and no free meals in Economy).
A Concorde has better pitch that subsonic Economy, comparable seat width and better service. And after spending 3...4 hours in a cramped tube exactly as you would on a subsonic narrowbody, you end up much further.
In case of Red Eyes, it would presumably be much more comfortable to fly by Concorde... If you, say, depart 1:00 by subsonic, fly 3:30 and cross 2 timezones, you arrive at your destination 4:30 by body clock, 6.30 locally. Fly the same schedule on a Concorde, crossing 5 timezones... your body clock is likewise 4:30, but the local time at destination is 9:30. Much more sensible time... you do not have to wait (and let your body clock get even more) before the locals wake up and get to work with you.
Is it more comfortable to get to work at 9:00 with your body clock at 7:00 (after subsonic Red Eye) or with body clock at 4:00 (after Concorde Red Eye)?
Of course, Paris is even more, 6 timezones ahead of American east coast. So, in order to show up somewhere in Paris at 9:00 locally, 3:00 body clock time, you
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