This is the c/scheme that BEA (British European Airways) operated their One-Elevens in.  This was because there was East &amp; West Germany and the East would not allow German airlines to fly to West Berlin.  Only British or American airlines were permitted and as BEA used the One-Elevens on the internal German services they weren't allowed to have the large Union flag on the tail.  Politics.....
Ken Fielding
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