Between San Francisco and Seattle for example, Alaska offers 10 daily flights, including a recent announcement of adding 2 new departures in July. If you add in Oakland and San Jose airports, Alaska has 24 daily flights up to Seattle. Virgin pales in comparison, operating only 3 daily flights. In fact, Alaska Airlines and sister-airline Horizon offer flights to 16 airports in California alone, whereas Virgin America flies to only 3 airports in the Golden State.
Despite lacking daily flights, Virgin America is more about a wonderful onboard experience. Probably no other domestic airline offers such good onboard amenities and features as Virgin. But they are the new guy in town competing against Alaska, a familiar face to the Bay Area market. In time, we will see if both can survive in the same market.