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Incidently I've never felt any issue with any of the many nationalities EK have on their flights that I've ever received different levels of service from anyone in particular because of their background, but maybe I just don't notice such things
To be fair, on EK, only ever see the differences in economy for me Once it was so obvious, got a gruff service (practically throwing meals at us, and forgetting something altogether) by FA on the forward end of the trolley, with an eye roll, an apology, and an extra mini bottle of scotch from the FA on the back end of the trolley ....