San Francisco International Airport introduces Mobile Passport Control.

Mobile Passport Control (MPC) is now available to passengers arriving at San Francisco International Airport. The airport becomes the fifth to offer the service, joining Seattle-Tacoma, Chicago O’Hare, Hartsfield-Jackson Atlanta and Miami international airports.
The FTE Award-winning U.S. Customs and Border Protection (CBP) MPC app allows passengers to submit their customs declaration via their mobile device. They then receive an encrypted QR code to present along with their passport to a CBP officer, who can complete the customs and immigration process.
The service, which helps to reduce queuing times, can be used by US citizens with a valid US passport and Canadian citizens with a valid Canadian passport and B1 or B2 visa status.