SFO has ABT printers at all mainline gates (I'm not sure about 76-79 UAX gates). I don't believe there are ABT printers at the international gates as the equipment there is owned by the city.
We tend to use the ABT on flights with lots of connections (i.e. DEN, IAD, ORD). If you want an ABT tag just ask. I don't think you'll have a problem but don't ask for an ABT tag on the jetway.