They are not very rare. Letter suffixes are very common in Europe to avoid potential ambiguity. However they do not change the actual flight number portion. htt

They are not very rare. Letter suffixes are very common in Europe to avoid potential ambiguity. However they do not change the actual flight number portion. https://www.flightradar24.com/blog/clearing-up-call-sign-confusion/ https://www.flightradar24.com/blog/clearing-up-call-sign-con...