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
DL miles cannot be used for IFC award tickets.
Many of the DL FF benefits are free upgrades on domestic flights. If you won't be traveling much on coach tickets within the USA, it's hard to make a case for DL, even though you can mix carriers on award tickets (if low is available and there aren't blackout periods) and have a stopover and an open jaw.