Let's put it this way, I'v been commuting for 10 years mostly on UA. The new slim line seats are not any more comfortable or any less comfortable than any other seat I have sat in. Maybe my expectations are not very high, set your expectations low and you will never be dissapointed. Coach is miserable and the cramming they do aft of ECON plus should be illegal but the seat is fine.

Thanks for the info on the tail numbers!! Hopefully we can fill in the rest of your list with airframes.