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Why do some airlines use alphanumeric callsigns in the flightplan when the flight number printed on the ticket consists of only numbers?

For example, the flight TK871 uses callsign THY4JT.

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when flight delays cause a duplication of a flight number- there is a suffix added. For example- flight 1423 DFW/OKC is also operating as OKC to DFW. Normally a turn of equipment- however, DFW/OKC delayed significantly- equipment and crew is available to operate 1423 OKC/DFW. These 2 could be in route simultaneously- one is usually designated as a suffix- 1423J Call sign American 1 4 2 3 Juliette

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    Welcome to Aviation.SE! Please read the [help] to see what makes a good question / answer. Also have a read of other answers on questions for examples of what makes a good answer. Generally well formatted answers with references do best. – Notts90 Aug 02 '17 at 20:08
  • The question is regarding completely changing the number from 871 to 4JT, not just adding a letter at the end. – fooot Aug 02 '17 at 22:22