It is not a rule, some flight numbers did not retire despite the major accident(s) it was involved in. According to Wikipedia:
On the other hand, other considerations may lead an airline not to change a flight number; for instance, the aforementioned "flagship" American Airlines Flight 1 retains its designation despite a major accident in 1962 and two other accidents in 1941 and 1936. There are at least four instances of the same flight numbers that have suffered two serious accidents: Flight 253 of Linea Aeropostal Venezolana (both in 1956, the first in June, and the second in November), Flight 869 of United Arab Airlines (the first in 1962 and the second in 1963), Flight 800 of TWA (the first in 1964 and the second in 1996), and Flight 383 of American Airlines (the first in 1965 and the second in 2016).
In my opinion, if there was such a list, which contains the old (crashed) flight numbers and the new ones, then Google or any other search engine might end up showing this information when you search for the new flight number, this will be enough reason for a superstitious person to change his/her mind, destroying the whole logic behind changing the flight number.
As for a source, there is none. However, same Wikipedia page lists some flights with both the old and the new flight numbers.
Credit:stackoverflow.com‘
4 Mar, 2024
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4 Mar, 2024