The U.S. Air Force said the sole-source, indefinite-delivery, indefinite-quantity award includes acquisition and sustainment activities in support of weapons modernization.
"This B-52 modernization contract will include several delivery orders over an eight-year period," Boeing added in a news release. "The Air Force announced a contract ceiling of $11.9 billion. This is a contracting vehicle that will allow engineering sustaining contracts, studies, production and other activities to occur in support of the B-52.
"No funds were committed with this contract announcement. We expect our first delivery order to be awarded on Sept. 30."
The first model of the long-range strategic bomber entered operational service with the Air Force in 1955.
Boeing said it has been continuously modernizing the aircraft -- including its engineering services and communication technology -- allowing the B-52 to remain a relevant weapon system.