Originally known as the Mitsubishi MU-300 Diamond, the Beechjet 400 is a light business jet manufactured initially by Mitsubishi Heavy Industries and eventually by the Beech Aircraft Company (Hawker Beechcraft), an American planemaker that is now a part of defense and aerospace conglomerate Textron. In total, over 900 aircraft have been delivered to customers over the years, including variants produced by both major manufacturers. Get all the latest aviation news from Simple Flying! Back in 2017, Hawker Beechcraft, which had now taken over the program, switched the name officially to the Beechjet 400 and began offering upgrade packages that could improve efficiency, performance, and range.

The aircraft, which has now undergone two separate name changes (as it was later rebranded again to the Hawker 400), is a light, low-wing aircraft powered by a pair of turbofan engines that features an all-metal construction. A capable business jet for the modern private traveler The aircraft is flown by a crew of two and can accommodate up to eight passengers, and was designed by Mitsubishi to serve as its largest and most capable corporate aircraft , one that improved upon the size, range, and capacity of the Mitsubishi MU-2. Once manufacturing was taken over by Hawker Beechcraft, the aircraft underwent extensive modifications, and would soon complement aircraft of the Cessna Citation family in Textron Aviation's commercial lineup.

This new upgrade is available for any Cessna Citation XLS.