Full scale or miniature prototypes of the long range strike bomber may have already been built for testing

Prototypes of new US long range strike bombers may already have been built and tested after it was revealed that spending on the project has jumped to $1 billion in 2015.

The U.S. Air Force is moving forward with plans for a top-secret next generation bomber that could one day fly without a pilot.

Spending on the project has topped a billion dollars this year alone – and companies vying to win a contract to build the bombers are already said to have built either full-scale or miniature prototypes and tested them in wind tunnels.

Spending on the long range bomber was $200 million in 2012.
A billion dollars has been spent in 2015.
Spending could increase to $3 billion in 2018.

100 brand-new bombers will hopefully cost as $55 billion in total. They will replace 1960s-vintage B-52s and B-1s from the ’80s.