The 1970s saw the birth of thewidebody, a radical new aircraft design in which airliners featured two aisles to accommodate more seats per row. The first was the Boeing 747, an iconic double-decker that would go on to become one of the most successful twin-aisle planes of all time, and rival McDonnell Douglas responded shortly afterwards with the three-engined DC-10, which evolved into the MD-11. Airbus would also enter the area in 1974 with the legendary A300.