波音E-4 先進機載指揮所( AACP )，即當前的“夜巡”飛機，是由美國空軍(USAF)運營的戰略指揮和控制 軍用飛機。 E-4 系列是從波音 747-200B為國家緊急空降指揮所( NEACP ) 計劃特別改裝的。 E-4 作為國家指揮機構的生存機動指揮所，即美國總統、國防部長和繼任者。四架 E-4B 由第595 指揮和控制大隊的第 1 空降指揮和控制中隊位於內布拉斯加州奧馬哈附近的奧夫特空軍基地。行動中的 E-4B 被稱為“國家空降作戰中心
The Boeing E-4 Advanced Airborne Command Post (AACP), the current “Nightwatch” aircraft, is a strategic command and control military aircraft operated by the United States Air Force (USAF). The E-4 series are specially modified from the Boeing 747-200B for the National Emergency Airborne Command Post (NEACP) program. The E-4 serves as a survivable mobile command post for the National Command Authority, namely the President of the United States, the Secretary of Defense, and successors. The four E-4Bs are operated by the 1st Airborne Command and Control Squadron of the 595th Command and Control Group located at Offutt Air Force Base, near Omaha, Nebraska. An E-4B when in action is denoted a “National Airborne Operations Center”

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