President Obama boards Air Force One at Andrews Air Force Base, Md., Friday, June 25, 2010, en route to Canada for the G-20 summit. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

President Obama boards Air Force One at Andrews Air Force Base, Md., Friday, June 25, 2010, en route to Canada for the G-20 summit. (AP Photo/Charles Dharapak)