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With regards your Oslo arrival - Norway is not an EU Member state therefore different immigration rules apply hence segregation from an EU arriving flight.
One other point to remember is that despite the massive increase in International flights and passengers at Aberdeen over the last couple of years - I don't believe there has been any increase in Customs/Immigration staff numbers - perhaps that needs looked at by those in charge?
Not defending their actions - just putting forward a different perspective!
Regards
DD