With four crew members on board, an Air Force cargo plane crashed and burst into flames in Anchorage, Alaska on Wednesday. Military officials did not say whether anyone survived. "With a ball of fire that big and a plume of smoke that high, it was probably nothing good," one eye witness said. An Air Force officer said the plane was practicing its maneuvers for an upcoming air show. The military may now reconsider whether to participate in such shows following the crash.