<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by tinnub:
I wonder if you can reserve with AMEX for promotion, then charge incidentals with a MC and get both the FFN stay and the airline voucher.</font>
I doubt it. Stays show up in your GP account as one or the other, and the rules for both promos indicate that the entire folio must be paid by the applicable card.