sentences:  The third engine of the US designs gave them the ETOPS performance needed for trans-Atlantic flights, but were unneeded for flights within North America, which the 300 could meet with lower operational costs.Douglas and Lockheed responded by using the show to pitch two-engine versions of their three-engine designs to compete with the A300.Japan's Ministry of International Trade and Industry had been trying to develop a shorter-range airliner they called the "YX" for some time, but had backed away from talks with Boeing after the value of the Yen fluctuated.