Anyway LAX would be interspersed with shorter rorations - its all to do with scheduling and flight planning.
It's all to do with operating routes profitably. Operating into two different airports only 350 miles apart would, as I posted earlier - be a folly in the context of the US West Coast. Of course the demand profile is very different for the East Coast - but why would Aer Lingus operate into LAX for only one day per week and SFO for two as you suggested above?
It makes absolutely no sense as far as I can see, from either a financial or operational perspective. The fixed costs associated with an Outstation only serviced once per week, given the current operating cost profile would in no way be covered.
A return to
one West Coast airport ex DUB would be marginal to say the least at present.
EI Premier