Over the last 20 years other airlines have lost a ton of money trying to elbow into the OAK-SoCal market. That's a game for very deep pockets and very patient shareholders (an oxymoron).
I really wish there'd be more players in the OAK-LGB/SNA/ONT market, especially because of the hell hole that's LAX. The WN planes certainly seem full to these, especially SNA. I guess for most airlines it's not worth sustaining just for O/D traffic since most airlines don't have the connecting hubs if it's not LAX or SFO.
I appreciate that JetBlue does OAK-LGB to route traffic to their LGB hub, though I'm curious how that route is doing since WN entered the market.