This is the #Boeing E-4 Airborne Command Post (aka Nightwatch or #Doomsday aircraft) of US SecDef Lloyd Austin during his recent trip to #Berlin (and a Bombardier Challenger of the German Government as a bonus). The E-4 is based on a Boeing 747-200B and in total four of these planes were built in the seventies. A replacement project has recently begun. The #plane is designed to remain airborne for a full week in case of emergency, if aerial refuelling is available. #planespotting #planespotters #avgeek #avgeeks #plane #planes