Often times I will hear a UAL flight identify itself with a letter after its call sign. For example UAL884K. What does the letter suffix indicate?
Thanks...Frank

It can vary depending on the circumstance, but often times the airlines will do this when the original flight was diverted, cancelled, or delayed for one reason or another. As an example, in the past, we've seen flights that took off as usual, but had to return for a mechanical problem. Once the problem was repaired, they took off again with the same flight ID, but a "D" was added to the end of it (I can only assume for "Delayed" or something).

Hope this helps!

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a suffix of T can denote a training flight and P a positioning flight.
In Europe, there has been a move to airlines using alphanumeric callsigns to lessen callsign confusion amongst their own and other airline callsigns, however the more they are used the more the problem reappears.
Alphanumerics make it hard to match the expected flight callsign as found on a ticket or in a timetable!

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