Scheduled, Passenger

• 'J' - Normal Service
• 'S' - Shuttle Mode
• 'U' - Service operated by surface vehicle

Scheduled, Cargo/Mail

• 'F' - Loose loaded cargo and/or preloaded devices
• 'V' - Service operated by surface vehicle
• 'M' - Mail only
• 'Q' - Passenger/Cargo in Cabin 

Additional flights

• 'G' - Passenger Normal Service
• 'B' - Passenger Shuttle Mode
• 'A' - Cargo/Mail
• 'R' - Passenger/Cargo in Cabin

Charter

• 'C' - Passenger Only
• 'O' - Charter requiring special handling (e.g. Migrants/Immigrants)
• 'H' - Cargo and/or Mail
• 'L' - Passenger and Cargo and/or Mail

Others

• 'P' - Non-revenue (Positioning/Ferry/Delivery/Demo)
• 'T' - Technical Test
• 'K' - Training (School/Crew check)
• 'D' - General Aviation
• 'E' - Special (FAA/Government)
• 'W' - Military
• 'X' - Technical Stop (for Chapter 6 applications only)
• 'I' - State/Diplomatic
• 'N' - Business Aviation / Air Taxi

Company specific (not IATA standard)

• 'Y' - Company specific.
• 'Z' - Unknown or other than any of the defined categories above.
  This might be because no information has been received, or because none of the IATA types cover this type of flight.