http://aviationweek.com/awindefense/short-cash-kc-46-usaf-looks-upgrade-kc-135
Short On Cash For KC-46, USAF Looks To Upgrade KC-135
Mar 5, 2017 Lara Seligman | Aerospace Daily & Defense Report
ORLANDO – Strapped for cash to buy Boeing’s new KC-46 tanker in sufficient numbers, the U.S. Air Force is looking instead to outfit its 60-year-old KC-135 Stratotanker with state-of-the-art survivability upgrades so it can fly for another 40 years.
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60년 사용 + 개량해서 40년 더 사용 = 100년 사용
진짜 보잉기체들은 대단하네요.
100년 폭격기(B-52)에 100년 탱커(KC-135)에 100년 전폭기(F-15K)