(Editor's note: This story has been updated to include a comment from the Air Force.) A key contractual milestone for the KC-46 tanker program expected to be achieved this summer has been pushed to mid-2021 due to supplier qualification delays, Inside Defense has learned. A spokesman for prime contractor Boeing confirmed this week the company is awaiting delivery of fully certified wing aerial refueling pods (WARPs) from a supplier and will not meet the criteria for required assets...