The story goes that Air Force One was over the UK a few years ago and called up a USAF base “Requesting Radar”. “What is you position?
” asked ATC “You got radar you find us” Air Force One replied. After a few minutes ATC announced “Air Force One we’re changing frequency” “What frequency are you changing to?
” asked Air Force One “You’ve got 720 channels – you find us!” ATC replied.