Which of the following is an example of an aircraft manufacturer?

Airbus is a well-known global aircraft manufacturer that designs, produces, and sells a range of commercial airplanes. The company is recognized for its innovative engineering and has a significant impact on the aviation industry with products such as the A320, A350, and A380 aircraft. Airbus's role as a manufacturer includes not just the assembly of aircraft, but also the development of related technologies and systems, which showcases the comprehensive capabilities of an aircraft manufacturer in the industry.

On the other hand, NASA primarily focuses on aerospace research and the development of space exploration technologies, not on manufacturing aircraft for commercial use. FlightSafety is a training provider that offers simulators and training services for pilots and crew but does not manufacture aircraft. Honeywell is a technology and manufacturing company that produces aerospace components and systems, but it does not build aircraft itself. Thus, Airbus stands out clearly as the entity that is directly involved in the manufacturing of aircraft, making it the correct choice in this context.