Join Date: Jan 2011
Location: In order of nights spent: MSP, ORD, OGG, FCO, LHR
Programs: DL 1MM Dia, AA Plat, UA 1MM Gold, HHonors LT Dia, Marriott/SPG LT Plat Prem
Posts: 473
Since no-one mentioned this, I will chime in. Buying the ticket with the card has nothing to do with the free baggage.
You don't have to buy your ticket with the card to get the free checked bag, nor does anyone you are traveling with on the same PNR. It's only about you as the primary card holder traveling, and those traveling with you on the same PNR. You can buy the vacation with AMEX Points, Delta Sky Pesos, on a VISA card, Chase Ultimate Rewards, doesn't matter as long as the primary card holder is traveling on the same PNR everyone (up to the limit) with that primary card holder will get 1 checked bag for free.