US ultra-low-cost carrier based in United States.
| IATA Code | NK |
|---|---|
| ICAO Code | NKS |
| Callsign | SPIRIT WINGS |
| Operating Status | Active (per OpenFlights airline registry) |
| Country | United States |
| Category | US ultra-low-cost carrier |
When you see a segment line like this in a PNR, the airline code identifies Spirit Airlines:
2 NK 587 Y 15JUL 2*JFKLHR HK1 800A 2000P
The two-letter code NK at the start of the segment line is Spirit Airlines's IATA code — every flight segment operated by Spirit Airlines in a GDS PNR (Amadeus, Sabre, Galileo, or Worldspan) begins with this code, followed by the flight number.
Spirit Airlines is a us ultra-low-cost carrier, based in United States. Its ICAO code, NKS, is used for air traffic control and flight planning, while its radio callsign is “SPIRIT WINGS”.
Once a NK segment is sold, the fare quote and ticketing entry differ by system. The starting point in each is:
Amadeus: FXP Sabre: WPNCB Galileo: FXP
Each of these prices the itinerary using the lowest applicable fare for the NK segment(s) in the PNR — the exact fare basis and rules still need to be checked against Spirit Airlines's current fare filing, since GDS pricing reflects what's filed, not a fixed rate.
Like most airlines, Spirit Airlines's fare classes follow the standard GDS booking-class letter system. See our complete booking class guide for what each letter (F, J, Y, and so on) typically means.
Spirit Airlines's IATA code is NK. This two-letter code appears at the start of every flight segment operated by Spirit Airlines in a GDS PNR.
Spirit Airlines's ICAO code is NKS. The ICAO code is a separate, usually three-letter identifier used mainly in air traffic control and flight planning, distinct from the IATA code travel agents see in a PNR.
Paste the raw PNR text into PNRGenius and it will automatically detect Spirit Airlines's segments (marked with the NK code) and build a clean, client-ready itinerary in seconds.
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