UK leisure carrier based in United Kingdom.
| IATA Code | BY |
|---|---|
| ICAO Code | TOM |
| Callsign | THOMSON |
| Operating Status | Active (per OpenFlights airline registry) |
| Country | United Kingdom |
| Category | UK leisure carrier |
When you see a segment line like this in a PNR, the airline code identifies TUI Airways:
2 BY 587 Y 15JUL 2*JFKLHR HK1 800A 2000P
The two-letter code BY at the start of the segment line is TUI Airways's IATA code — every flight segment operated by TUI Airways in a GDS PNR (Amadeus, Sabre, Galileo, or Worldspan) begins with this code, followed by the flight number.
TUI Airways is a uk leisure carrier, based in United Kingdom. Its ICAO code, TOM, is used for air traffic control and flight planning, while its radio callsign is “THOMSON”.
Once a BY 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 BY segment(s) in the PNR — the exact fare basis and rules still need to be checked against TUI Airways's current fare filing, since GDS pricing reflects what's filed, not a fixed rate.
Like most airlines, TUI Airways'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.
TUI Airways's IATA code is BY. This two-letter code appears at the start of every flight segment operated by TUI Airways in a GDS PNR.
TUI Airways's ICAO code is TOM. 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 TUI Airways's segments (marked with the BY code) and build a clean, client-ready itinerary in seconds.
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