McDonnell is considering a stretched MD-11.

If the company goes ahead with construction, it hopes to have the stretched version in service by 1993, three years after the standard 276-seat, three-engine MD-11 becomes operational. The plane would be designed to carry 430 passengers in two classes, or up to 450 in a single class, more than 5,000 miles, a much shorter range than the standard version MD-11, McDonnell Douglas Corp. officials said.