Ladies and gentlemen, we are missing the obvious solution. I think we should all spend a few bucks on elastic knee braces and slip them on at the airport, then we can all claim to need some extra time going down the jetway as pre-boards....I have seen too many times, especially at EWR and LAS where one guy with a brace can bring all of his friends and family with him on the pre-board. So, stop complaining because they are not listing and start shopping.. just avoid the ones with steel supports, TSA does not like them.