I'm sure this is buried somewhere but thought a more recent review might help. The question is simple, why do some DL 737-800's have in seat video and others overhead? I would think that this work horse would be one of the first to be converted, but probably has to do with major maintenance schedules.

Seat Guru states: Most of Delta's Boeing 737-800 coded 73H feature AVOD in addition to personal satellite TV at every seat. All other 737-800s, coded 738 or 73Y, still have overhead TVs in both cabins. Delta is in the process of converting all 738s to 73Hs.

Can one anyone answer what the conversion timeframe is? I ask because I seem to get a lot of the 73Ys for Atlanta to west coast runs.