Air Force One over the Bay Area? Dec. 17

Friday afternoon, Dec. 13, a large white jet, with a blue nose, was seen flying over the Bay Area at a high-rate of speed.  The flight path is not normally used by commercial aircraft for West to East travel.  However, clear skies, and binoculars revealed the two jet engines on each wing, and the familiar front hump, which is distinctive on 747 jets.  It looked like Air Force One, but that cannot be verified.  President Obama was in South Africa last week to attend and speak at a Mandel Memorial Service.