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
You can't "upgrade" with miles on an award ticket, although you can cancel the tickets for $150 each, redeposit the miles, and get a new FC ticket with miles provided that there is FC award availability (and that you have enough miles).