FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,047
You cannot rely on a reasonably priced upgrade offer, either in advance or at the airport.
Manage your Booking fairly regularly and grab whatever works for you.