SFO is weird, because it's a United hub, but there's just enough competition from Alaska nee Virgina America and Southwest that I could see being tempted off Un

SFO is weird, because it's a United hub, but there's just enough competition from Alaska nee Virgina America and Southwest that I could see being tempted off United. Unlike say, Denver or Salt Lake for United and Delta respectively. I'd also put SEA in this category, especially with Alaska and Delta no longer playing nice in the sandbox.