The Learjet 55B, also known as the Bombardier Learjet 55B, is a midsize twin-engine corporate jet aircraft, developed by Gates Learjet Corporation, today Bombardier Aerospace of Canada. Introduced in 1986, the Learjet 55B is a further development of the Learjet 55, with a digital flight deck, modified wings and wingspan, improved interior and gross takeoff weight. The Learjet 55B features a stand-up cabin with a fully-enclosed aft laboratory and external and internal baggage compartments. The Learjet 55B is capable of carrying up to 8 passengers in a club seating arrangement with a side-facing bench and an additional aft seat. The Learjet 55B is larger, heavier, more commodious, and has a much longer range than earlier versions of the aircraft. When compared to other midsize jets, the Learjet 55B stands out by its outstanding performance, flexibility and safety.