Design
The E-4B is designed to survive an EMP with systems intact, and has state-of-the-art direct fire countermeasures. The E-4B uses analog instruments because they are less susceptible to an EMP. The E-4B is capable of operating with a crew of 48 to 112 people, the largest crew of any aircraft in US Air Force history. With in-flight refueling it is capable of remaining airborne for a considerable period (limited only by consumption of the engines' lubricants). In a test flight for endurance, the aircraft remained airborne and fully operational for 35.4 hours. It takes two fully loaded KC-135 tankers to fully refuel an E-4B.
The E-4B has three operational decks; upper, middle and lower.
Read more about this topic: Boeing E-4
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