I don't know of anything around LAS, which is a bit surprising considering the number of tourists and the 'conservative' climate.
SFO a bit better, although none of these are what I'd consider to be must-see collections:
http://www.westernaerospacemuseum.org/ at Oakland airport
http://pacificcoastairmuseum.org/ at Santa Rosa about 1 hour North.
http://www.travisairmuseum.org/html/visitor_info.html Travis AFB between Oakland and Sacramento - the website seems to indicate it's PPO due to 'security concerns'
(it's a freakin'
museum you dolts !)
Also in Oakland is the USS Hornet although there are no aircraft aboard.
http://www.uss-hornet.org/