Airports are one of the places 12oV makes lots of sense. Most cars sit for many hours, some for days at long-term parking. And it's very cheap to install, probably less than 10% the cost of a Level 2 unit.
A few Level 2 charge stations would be useful in short-term parking, as well.
And more importantly, I'd suggest a DC Fast Charger, perhaps at the Cell Phone lot. The airport is a crossroads, and folks with an EV driving over 40 miles to pick someone up at SFO could charge up quick allowing them to not use a gas car.
Well done, SFO!