Two-pilot operations in American multiengine aircraft date back to World War II. America’s bombers—the B-17, B-24, and B-25—all relied on having two pilots in the cockpit.
In Europe, however, it was a different story. In Germany and England, for example, there was a shortage of pilots because of a decline in the birth rate after World War I—so much so that some heavy military aircraft were designed around single-pilot operations. The British Avro Lancaster B. Mk I, a four-engine heavy bomber, is one of those.
