Lockheed L-749 Constellation
The Lockheed L-749 Constellation is the first Lockheed Constellation to regularly cross the Atlantic Ocean non-stop. Although similar in appearance to the L-649 before it, the L-749 had a larger fuel capacity, strengthened landing gear, and eventually weather radar.
Source: Wikipedia — Lockheed L-749 Constellation (CC BY-SA 4.0)