California - Best Airline Programs for SAN Based?

I am 2P (Premier/Silver) on UA. What other airlines and FF programs make sense ex-SAN? Frequent destinations in rough order are: LAX, SFO, NYC (any), ORD, IAH, MSY, DFW. Fly international usually once a year, SE Asia, Europe.

Any suggestions? AA? HP?

I'd say if you're adding an airline in addition to UA out of SAN, probably AA is your best bet given your destinations.

Since SAN has no hub it really depends on your patern of travel. For me I fly mainly to ABQ, ORF, PHX, LAS,SJC,BWI and HNL so it makes sense to fly mainly Southwest espicially since I earn a free ticket each year. I also have HP as they are the closest Hub to all points east (LAX is too expensive and complicated to get to) I have a lifetime America West Club so even flying Southwest I can use it. Flights to Hawaii can be credited into HP. HP partners with NW on some routes so I also have a World Perks account. So three memberships do it for me. You could make an argument I suppose for other carriers on different travel paterns I suppose.