Wikipedia lists N8 at the IATA code for National Cargo Airlines (ICAO NCR), a regional airline based in Orlando, Florida. AirlineCodes.info and other sources list N8 as the code for Fika Salaama (ICAO HGK), which is based in Uganda. Both are currently in operation. What on earth is going on here?
IATA issues duplicate airline codes to regional airlines where the codes are not likely to overlap, from Wikipedia:
Controlled duplicates are issued to regional airlines whose destinations are not likely to overlap, so that the same code is shared by two airlines.
This happens because IATA uses a 2-letter code for for airlines which has a limited range of available codes. Since NCA doesn't operate a passenger service in the same region as Fika Salaama, it would be very unlikely to confuse the two.
If you check IATA's own code database, N8 is used for only one airline: National Air Cargo Group, Inc., doing business as National Airlines.
The same search tool says that Fika Salaama doesn't have an assigned IATA code. I'm curious how you know that it's in operation; Google can't find any direct information on it, and third-party aviation sites come up with automatically generated pages. As we've seen here before, there's a lot of incorrect - or at least outdated - information out there that doesn't always match what IATA's own database says.