what does "together with that which was already being received from the Cabinet plane"mean? Because he had not been briefed, the new President was unaware that conversations to and from 26000, 86970, 86971, and 86972 were monitored at Acrobat (Andrews Field) and automatically taped by the Signal Corps. Unfortunately, as General Clifton later explained to this writer, the device only operated when the planes were airborne. In this age of sophisticated eavesdropping, Angel dialogues were sometimes picked up by a group of zealous amateurs in Colorado, but a check has failed to uncover any such activity between 1:26 and 2:47, when Colonel Swindal took off and the turning reels at Andrews began to record voice traffic from the Presidential aircraft, together with that which was already being received from the Cabinet plane.