in february we booked a discounted partner ticket ZRH - MIA in F for beginning of november, booking class A. it seems that our outbound flight (09.50 am) is not available anymore but still our booking remains confirmed. swiss write that additional costs may occur in case the booking class of the new flight is different. if we rebook to let's say march 2021, the booking class would still be A and therefore no additional costs should occur. anyone made experiences with rebooking such a discounted ticket ?