Originally Posted by
Mark1976
in this instance it's LAX I have booked, want to change to SFO.
LAX and SFO are indeed the same zone. Don't forget SJC if SFO is not available. SJC gets - rather did get, who knows what the future holds - the Boeing 789, if such things matter to you....
As an aside, Head for Points (who posts here as
Raffles) has a handy little chart of all the cities and costs:
https://www.headforpoints.com/2019/0...ng-by-route-2/