Join Date: Jan 2008
Location: Orange County and oftentimes London
Programs: Marriott Bonvoy, HH Diamond, AA EXP, VS Gold, BAEC Silver, Global Entry, UK RT
Posts: 539
My most two recent experiences were being offered an upgrade at the airport for $1400 and on a different occasion scoring the upgrade by having a winning bid on the online auction. The LAX-LHR routes always go out full so odds are slim (though not impossible) for a day of upgrade at the airport but it will usually be expensive. You might want to try the auction. I put a bid in at the low end ($1000) and was surprised that it was accepted for my flight in February.