Do two airlines have IATA code N8?
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.