UA 742 BOS - DEN on Friday, 9 Mar. We were in 21 BC, in a configuration which showed 3 E+ seats in row 21. The configuration now shows 3 E+ seats in row 20, as before, but row 21 is just two seats (no A) and we were moved to 20 AB. 21 BC is available. It is not listed as E+. But, being an exit row, does it have similar legroom to the exit row in 20? If so, I will move there ASAP. I prefer an aisle, but definitely want the exit row legroom. This now seems to be the configuration Seat Guru calls 757 layout 3.
What the app shows only adds to my confusion. Note that it shows 3 rows as exit on the R side of the plane but only 2 on the L.