Travel

January 14, 1943, President Franklin Roosevelt traveled by plane from Miami to Morocco to meet with Winston Churchill. FDR was the first president to travel by plane while in office. 

It was at this conference, which Stalin did not attend, that unconditional surrender of the Axis Powers was the only option. 

http://ww2today.com/14th-january-1943-churchill-and-roosevelt-meet-at-casablanca