(AP)-- The U.S. Air Force has signed an eight-year contract with Boeing Co. worth $11.9 billion for upgrades to B-52 bombers.
The Defense Department says that Wright-Patterson Air Force Base in Ohio is handling contract activities.
Shares of Chicago-based Boeing rose 79 cents to $66.76 in after-hours trading, after finishing regular trading up $1.45 at $65.97.
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