As they fly wing-to-wing over a vital spot in the development of the atomic bomb, a native of Japan and a former U.S.

The Hawaii Mars water bomber, which first took to the skies in the late 1940s, made its final flight on Sunday before landing in Victoria, B.C., where it will find its permanent home.

Crews have to work through what happens if their plan falls apart. For B-2 bombers, that means training for contingencies, learning how to manage fatigue, and simulating long flights.