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In page Boeing KC-135 Stratotanker:
"In 2006, the KC-135E fleet was flying an annual average of 350 hours per aircraft and the KC-135R fleet was flying an annual average of 710 hours per aircraft. The KC-135 fleet is currently flying double its planned yearly flying hour program to meet airborne refueling requirements, and has resulted in higher than forecast usage and sustainment costs.[citation needed] In March 2009, the Air Force indicated that KC-135s would require additional skin replacement to allow their continued use beyond 2018.[4]
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