 The President waited for Jacqueline Kennedy, who in turn would not leave Dallas without her husband's body, to arrive aboard Air Force One.Kennedy's casket was finally brought to the aircraft, but takeoff was delayed until Johnson took the oath of office.There was concern that since the Secret Service had taken the body of Kennedy from Parkland Hospital against the wishes of the Dallas medical examiner, Earl Rose, who had insisted an autopsy was required, the Dallas Police Department would seek to prevent Air Force One taking off.