There are no co-terminals to
SEA, PDX or
TUS, to my knowledge.
About the only time I ever use
co-terminals is when I have a ticket SEA/SFO/SEA and decide at the last minute that it is more convenient to fly SEA/SFO/SJC/SEA. When I do that I fly standby, but have never had a problem on AS being MVP Gold.
Are there really smoking deals to TUS? When are you going?
I think I must be getting even lunier in my old age. I am at some deep down level thinking of joining you even though I don't need the miles.