Originally Posted by
bbinchi
Your comment piqued my curiosity so I checked AS21's history on Flightradar24. Sure enough, on Saturday, 6th January 2018 the flight was operated with a Boeing 737-790 aircraft (N622AS) that would not have seat power. A rare occurrence indeed.
None of the 737-400's and 737-700's have seat power. AS swaps planes all the time. What you book or expect can change any time through day of departure