Originally Posted by
craigthemif
VS might offer much cheaper upgrades at the airport. Since SFO-LHR is a route with strong premium traffic, they don't want to fill J seats prematurely.
Much depends on whether Upper Class is empty and/or PE full - in which case VS will attempt to extract some added value before giving out free opups.
Great, figured as much, simple(ish) economics at the end of the day - I think I'll just hold out and hope they have lots of capacity in Upper Class