Join Date: Oct 2000
Location: Munich, Germany
Programs: LH HON, DL FO/MM, Marriott Lifetime Platinum, Accor Lifetime Platinum, Sixt Diamond
Posts: 6,174
You can switch, but only if there are V/X seats avaiable at this time.
If there aren't, you're screwed and the trip costs you the coupon - you cannot switch at the gate!
I guess that's one reason why we're waitlisted more and more for the upgrades.