Cabin Pressures?
 

Having flown as a passenger on Concorde around 40 times I wish that there is a place for a passenger aircraft that has a cabin pressure of 4,000' and not 8,000' or more. [ I am sure some operators operate at nearer 10,000' to save fuel. ]
I am sure that apart from the wow factor of flying in such a beautiful work of art at Mach 2, the other plus is the lack of dehydration and general feeling of well being, breathing air with at least some oxygen in it! I suppose the friction heat generated, allows for more humidity which would not happen on a subsonic machine.

Happy with my unpressurised, decidedly subsonic SkyArrow 650T

B J
Non Professional Pilot