Aerospace mega projects: This is a list of top 10 aerospace mega projects, i.e., extremely large-scale investment aerospace projects. All these projects cost more than US$1 billion and attract a lot of public attention because of substantial impacts on communities, environment, and budgets. The number of such projects is so large that the list may never be fully completed.
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10. Rockwell B-1 Lancer
Rockwell B-1 Lancer is a four-engine supersonic variable-sweep wing, jet-powered strategic bomber used by the United States Air Force (USAF). It was first envisioned in the 1960s as a supersonic bomber with Mach 2 speed, and sufficient range and payload to replace the Boeing B-52 Stratofortress. It was developed into the B-1B, primarily a low-level penetrator with long-range and Mach 1.25 speed capability at high altitude. The B-1B entered service in 1986 with the USAF Strategic Air Command (SAC) as a nuclear bomber.