To me "Ms" always seems to indicate the person using it is insecure, or at least they they believe there is something inferior with one or other of the traditional titles.
I'm a Mrs , as it happens, and previously was a Miss. Have never been a Ms.
However, I don't think it's insecurity at all - I think it's because it's no-one else's damned business whether any particular woman is married or not.
Women should be free to call themselves by whatever designation they wish, and airlines need to find other ways of determining weigh averages.
Will these weight calculations be affected by TW (who are men) pushing up the average weight unexpectedly? Or is there just an average weight for adults which covers both sexes?
How are average weights determined? People of both sexes are heavier (on average) now than they were even 50 years ago - how often are they updated? I can see that they have to have approximations, and that fuel is so incredibly expensive (and volatile) that they won't want to use more than necessary, but it must necessarily be a ballpark calculation, because you can't ask people their weight on booking..