Boeing Seeks Revised Schedule for U.S. Aerial Tanker

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Boeing Co. is revising its master schedule for developing the new U.S. Air Force aerial tanker, adding to uncertainty about a plane that already has run up an estimated $1 billion in excess costs for the contractor.

The Air Force “has been continually monitoring” Boeing’s “progress on their internal schedules, and as we get” the contractor’s proposed revised time line “we will continue to assess the milestones,” Ed Gulick, a spokesman for the service said in an e-mailed statement.