Here are the most expensive planes ever built by the military. ... The plane that would become the SR-71 Blackbird started as a CIA aircraft known as the A-12 Oxcart.

It was the most costly accident in the history of the air service, and the most expensive plane crash ever. The aircraft was destroyed and the total loss was estimated to be $1.4 billion! Costly B ...

-The B-2, known for its pioneering “flying wing” design and stealth technology, remains a key component of the U.S. strategic bomber force, though it has been one of the most expensive planes ...