This happens a lot when your flying with Alaska or Southwest. Both airlines have significant MAX fleets and will change the dispatch schedule for aircraft fa

This happens a lot when your flying with Alaska or Southwest. Both airlines have significant MAX fleets and will change the dispatch schedule for aircraft fairly often, in my experience on Alaska it happens about 10~20% of the time. Also, Southwest does not assign seats and Alaska does not have a difference in seats between their -900 and MAX 9 aircraft. Although with Alaska I have had my seat reassigned because they changed from a -900/MAX 9 to a -800 before.