To avoid the toxic cabin air and save on weight, many of these planes are pressurized. The Swearingen Fairchild Metro III Expeditor was one of the first in its class to feature a pressurized cabin, making it a popular commuter among Swedish Air Force pilots as well as royalty like Queen Elizabeth II. Over 1000 aircraft from this series have been built since their initial release in 1971; they remain staples for those looking for an affordable flight experience with unparalleled safety features!