A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
Officially it needs to be cancelled and rebooked, based on current inventory availability and currently applicable fares. However, many phone agents will just make changes, especially if doing so is faster and easier.