Which types of aircraft successfully flew across the Atlantic Ocean in 1919?

The successful transatlantic flights in 1919 were achieved by the Vickers Vimy, which was a British aircraft specifically designed for such long-distance flights. The significance of this accomplishment lies in the aircraft's ability to traverse several thousand miles of ocean, demonstrating advancements in aviation technology following World War I. The Sopwith Atlantic is also recognized for its contribution to early aviation efforts, although its significance is less prominent compared to the Vimy.

During this era, flights across the Atlantic were challenging due to factors such as limited range, navigation difficulties, and lack of reliable weather forecasting. The achievements of the Vickers Vimy and the Sopwith Atlantic helped lay the foundation for the future of commercial and military aviation.

The other options include aircraft that did not exist or were not in flight status during 1919. The Fokker Dr.I and Junkers D.I were primarily World War I fighters. The Douglas DC-3 and Boeing 747 are much later developments, representing advancements in commercial aviation during the mid-20th century. Similarly, the P-51 Mustang and B-17 Flying Fortress were World War II aircraft, showing the evolution of military aviation after the 1919 flights.