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McDonnell Douglas MD-81

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description McDonnell Douglas MD-81 Overview

The McDonnell Douglas MD-81 is a twin-engine, narrow-body commercial airliner and the initial production variant of the MD-80 series. It features a T-tail design and rear-mounted Pratt & Whitney JT8D turbofan engines, representing an extension of the earlier DC-9 airframe to accommodate more passengers. The MD-81 entered commercial service with Swissair in October 1980. The aircraft was designed primarily for short to medium-haul routes, offering seating configurations for approximately 130 to 170 passengers, depending on the specific airline layout.

help McDonnell Douglas MD-81 FAQ

What is the difference between the MD-81 and other MD-80 variants?

The MD-81 was the first production variant of the MD-80 family, which later included the MD-82, MD-83, MD-87, and MD-88. All share the same T-tail design and rear-mounted Pratt & Whitney JT8D engines, but differ in range, fuel capacity, and minor systems. The MD-81 typically seated around 150 passengers in a standard layout.

Which airline was the launch customer for the McDonnell Douglas MD-81?

Swissair was the launch customer, placing the MD-81 into scheduled service in 1980. The aircraft replaced earlier DC-9 models on short- and medium-haul European routes. Swissair's adoption helped establish the MD-80 family's reputation for reliability among European carriers.

How does the MD-81 compare to the earlier DC-9?

The MD-81 is significantly longer than the DC-9-50 and can carry more passengers, roughly 150 versus the DC-9's 100-120 in typical configurations. It also introduced updated JT8D-209 engines with better fuel efficiency and lower noise. Despite the changes, it retained the DC-9's fundamental airframe and T-tail configuration.

Are there any MD-81s still flying commercially?

Very few MD-81s remain in commercial service today, as most carriers have retired them in favor of more fuel-efficient aircraft like the Airbus A320 and Boeing 737 NG. Aging airframes, high fuel consumption, and stricter noise regulations have accelerated their retirement. Some examples survive in cargo, charter, or museum roles.

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