Originally Posted by pandaperth

I cannot comment on BA upgrades - I've never been a member of that program.

With AA SWUs - each one can be used to upgrade up to three AA-marketed and operated flights. They have to be heading in the same direction, more or less. So for instance one could upgrade HKG-DFW-MIA-LHR using one SWU, but not say LHR-LAX-MIA-GRU.