Overun,
"NITRO" was the callsign of the TNT flights under the Air Foyle AOC.
Since the transfer to TNTs own AOC the callsign is the awful "Qualitay", the 3 letter code is TAY.
I always thought "NITRO" was one of the most apt callsigns ever.
Our callsign is "Eurotramp", sorry "Eurotrans".