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PSA Airlines has the same IATA 2-letter code, "OH", as the now-defunct carrier Comair. Yet - the two companies are not related.

How is it, that IATA reassigned the same code to an unrelated carrier rather than assigning a new code? Are there any other cases of this happening?

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  • $\begingroup$ I would guess that since Comair is defunct, there is no chance of conflict in paperwork, routing, or ATC communications when using "OH" to refer to PSA, so there's no concern about reusing the IATA code. $\endgroup$ – FreeMan Dec 10 '19 at 16:27
  • $\begingroup$ @FreeMan: That just means it is feasible to do this, it doesn't mean it's a good idea... why have codes if they're not unique? It's not like IATA is out of two-char codes for airlines. $\endgroup$ – einpoklum Dec 10 '19 at 16:41
  • $\begingroup$ The Wiki page gives a straight-foward explanation of how, when, and why codes are reused. en.wikipedia.org/wiki/Airline_codes $\endgroup$ – zymhan Dec 10 '19 at 18:40

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