How did we arrive at the data?
I took publicly available seat counts and other published data showing available data and came up with these estimates. I do not guarantee 100% accuracy, but I think we are fairly close to the true numbers. OAG, Various Source websites, airline sites etc.
Assumptions:
AeroMexico - 62 flights with 99 seats
Air Canada - 177 flights with 76 seats
Avianca - 29 flights with 96 seats, two flights with 150 seats
British Airways – 27 flights with 337 seats, three flights with 226 seats
Emirates - 31 flights with 354 seats
Icelandair - 15 flights with 183 seats
Interjet - 54 flights with 150 seats
Japan Airlines - 31 flights with 195 seats
Korean - 21 flights with 277 seats
Lufthansa - 18 flights with 255 seats, 13 flights with 281 seats (A346)
Qantas – 31 flights with 484 seats inbound and 355 seats outbound (lower outbound estimate for blocked seats)
Qatar – 31 flights with 358 seats
Volaris - 13 flights with 179 seats
WOW Air - 12 flights with 345 seats

Source Data: DFW Airport