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As far,as I'm aware, the two original Buffalo Electras came from Amer Air in Austria. One of these had a landing incident but has since been repaired. Buffalo then added another two Electras that had been stored at Coventry which were formerly reeve allutian machines.They then added a further two ex coventry machines last year. It seems like it's only the two former Amer Air Electras that have the unusual apu arrangements.