Originally Posted by
Mauricio23
It happens all the time. When there is a fin change, seats are randomly reassigned irrespective of whether the aircraft have the same seating configuration or not. There was a thread a few months ago with several experiences of people paying for a preferred seat and being reassigned to the back of the bus, even though the same preferred seats were available in the new aircraft. Another gem of AC IT for you.
I don't believe these events are simply "a fin change." These must have been changes of plane configuration. For example, between differently configured 763s, or 320s.
When does a specific fin get assigned to a specific flight? Not that early in advance I would guess. Remember when some planes had been XMed and some not. Often, J seat map would change a couple of days before the flight. Or even the day of the flight. So fin change by itself should not result in seats being messed up. Only if there is a change of configuration.
Plus, row 18 is bassinet row.