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: 102,617
Take printed copies of your itineraries that show PNRs, ideally on each carrier. Also take a printed copy of your receipt showing the ticket number(s). Sometimes airline staff can check you in from the ticket number but not from just the PNR if there's a problem, assuming that the ticket was correctly issued.