Join Date: Jul 2010
Location: BUR
Programs: AA, DL Platinum, AS, AF/KL, UA, VS, HA, Hilton Gold, Marriott Gold, Hertz Presidents Circle
Posts: 1,788
As mentioned on another thread, changing seats on one AF flight cancels the seat reservation on a connecting DL metal flight on the same PNR. Also you'll be allowed to change seats on a desktop web browser but not on the iPad app for some but not all flights with no apparent rhyme nor reason.