Will, Southwest did serve San Francisco unitl 2001. However, the major weather delays and high costs at the airport caused Southwest to build up its presence at the less congested Oakland until the point that San Francisco wasn't necessary.
If you absolutely must have low fares from SFO to BUR, give Richard Branson a call so he could think about it for Virgin America. Until then, just take Herb's boys to Oakland and take BART into San Francisco. You'll save yourself quite a bit of time and money compared to the Not-So-Friendly Skies of United.
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