Waymo has been granted a permit to start testing its autonomous vehicles at San Francisco International Airport, ahead of the launch of a commercial service.The San Francisco mayor’s office announced Tuesday that the airport, known as SFO, and Waymo have signed a “Testing and Operations Pilot Permit” after years of back-and-forth negotiations. The deal with SFO comes just two weeks after Waymo was cleared to start testing at nearby San Jose Mineta International airport. SFO is not the first airport that Wa ...