Join Date: Jan 2006
Location: DEN
Programs: UA 1K (MM), DL, AA, AS, HHonors, SPG, Kimpton, Hyatt, IC PC, Marriott Titanium (LT PLT), Hertz PC
Posts: 7,231
L fare, Silver on ATL-SEA has very little chance at an upgrade, AMEX Plat or not. Sorry!
There will be plenty of plats clearing for upgrades, and maybe a gold or two.