The Learjet 45 is a mid-size business jet designed by Learjet and manufactured by Bombardier Aerospace. The aircraft was first announced in October 1993, and first flew on October 7, 1995. It was designed to replace the Learjet 35 and 36 series with a more advanced design that incorporated new technologies and improved performance. The aircraft was designed to have a greater range than its predecessors, with a maximum range of 2,040 nautical miles and a maximum cruising speed of Mach 0.81.

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The Learjet 45 was designed to meet the needs of the business aviation market, offering a larger cabin, increased payload, and better fuel efficiency than the previous models. Its cabin was designed to be more comfortable than previous Learjet models, with a wider cabin, larger windows, and improved noise insulation. It was also designed with a two-zone temperature control system and a cabin pressure altitude of 10,000 feet. The aircraft also featured advanced avionics, including an integrated avionics suite with a modern glass cockpit.

The Learjet 45 was well-received by business aviation customers, with more than 700 aircraft being sold in the first decade of its production. The aircraft has remained popular in the business aviation market, with many operators taking advantage of its increased range, speed, and comfort. However, the aircraft has also faced some safety issues over time, including a series of incidents involving the aircraft's Pratt & Whitney JT15D-5 turbofan engines. In 2006, the Federal Aviation Administration issued an emergency airworthiness directive requiring operators to inspect the engines for certain potential faults.

The Learjet 45 brought several innovations to the business aircraft market, including the first application of a full fly-by-wire flight control system in a business aircraft. The fly-by-wire system was designed to reduce pilot workload and improve aircraft performance. The aircraft also featured an advanced FADEC engine control system, digital avionics, and a high-speed data link. The aircraft also featured an advanced autopilot system, which allowed for precise control of the aircraft even in difficult conditions.

The Learjet 45 is a popular business jet, with many operators taking advantage of its improved performance and comfort. It is also one of the most advanced business jets on the market, incorporating the latest technologies and features. While the aircraft has faced some safety issues over time, it has remained a reliable and capable aircraft, and is still widely used in the business aviation market.