Here is a picture of E3B-530. This CASA-Bücker was transferred by the Air Force to the Royal Aero Club of the Balearic Islands, it never carried a civil registration. Photo received from Pedro de la Cru.
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Here is E3B-530 in January, 1976 in Son Bonet (LESB), Spain.
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At one point, E3B-530 was we decorated with the famous SNOOPY aviator character.
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Now, E3B-530 flies in England as G-CDRU
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Brian