In this July 15, 2015 file photo, Uber driver Karim Amrani sits in his car parked near the San Francisco International Airport parking area in San Francisco. Hilton is hailing the ride sharing service Uber to help guests reach its hotels and then explore the city where they are staying, the companies announced Tuesday, Sept. 1, 2015. (AP Photo/Jeff Chiu, File)
In this July 15, 2015 file photo, Uber driver Karim Amrani sits in his car parked near the San Francisco International Airport parking area in San Francisco. Hilton is hailing the ride sharing service Uber to help guests reach its hotels and then explore the city where they are staying, the companies announced Tuesday, Sept. 1, 2015. (AP Photo/Jeff Chiu, File) Jeff Chiu AP
In this July 15, 2015 file photo, Uber driver Karim Amrani sits in his car parked near the San Francisco International Airport parking area in San Francisco. Hilton is hailing the ride sharing service Uber to help guests reach its hotels and then explore the city where they are staying, the companies announced Tuesday, Sept. 1, 2015. (AP Photo/Jeff Chiu, File) Jeff Chiu AP