Japan Airlines will continue to operate 3x weekly service from Tokyo Haneda (HND) to DFW until February 2, 2022, when it goes to a daily flight. Japan Airlines also currently operates 3-4x weekly flights from Tokyo Narita (NRT) to DFW, which will end on January 31, 2022.
So, as it stands now, Tuesdays, Thursdays, and Saturdays are flights to Tokyo Haneda, while the other days of the week fly to Tokyo Narita. When February begins, the only option will be Tokyo Haneda daily, which is preferred for most people anyway. All flights are on Boeing 787 aircraft.
Schedules:
JL12 HND 1055 0840 DFW
JL11 DFW 1030 1520 HND
JL8012 NRT 1055 0725 DFW
JL8011 DFW 1110 1550 NRT