|Quoting srbmod (Reply 1):|
One thing to remember is that pretty much all of these seat sites have not updated their seat maps to include Economy Comfort throughout the mainline fleet. Neither of those sites you mentioned are showing Economy Comfort on the 7863A at all. I do recall that prior to the roll out of Economy Comfort domestically, Row 13 on the 763As were missing a window, but with the reconfiguration of the cabin for Economy Comfort, I'm not sure that is the case. Had my ATL-LAS flight for next week not been changed to a 752, I could have answered the question for you just prior to your flight.