| ArrivalAirport | Arrival point of flight segment. |
 BookingClassAvails | A collection of availability counts per booking class. |
| Comment | Free text information that the marketing carrier may send about this flight.Textual information to provide descriptions and/or additional information. |
| DepartureAirport | Departure point of flight segment. |
| Equipment | The type of equipment used for the flight.Specifies the aircraft equipment type. |
| MarketingAirline | The marketing airline. This is required for use with scheduled airline messages but may be omitted for requests by tour operators. |
| MarriageGrp | Many airlines link connection flights together by terming them married segments. When two or more segments are married, they must be processed as one unit. The segments must be moved, cancelled, and/or priced together. The value of the marriage group must be the same for all segments. |
| OperatingAirline | The operating airline of the flight if it is a codeshare flight.Identifies the operating carrier and flight number. |
| StopLocation | A location where the flight is scheduled to stop en route to its destination for this flight segment. |
| TPA_Extensions | A placeholder in the schema to allow for additional elements and attributes to be included per Trading Partner Agreement (TPA).Allows extensions to be added to the OpenTravel specification per trading partner agreement. |
| ArrivalDateTime | Specifies the arrival date and time of a flight. |
| ConnectionType | Used to provide the type of connection for this flight segment.Used for Character Strings, length 0 to 8. |
| DateChangeNbr | The number of days by which the flight's arrival date differs from its departure date (e.g., +1, -1). |
| DepartureDateTime | The date and time of the flight segment departure. |
| DepartureDay | The day of the week of the departure. |
| Distance | Miles acquired per flight segment, usually used for earning of frequent flyer miles. |
| E_TicketEligibility | Specifies whether a flight segment is eligible for electronic ticketing. |
| FareBasisCode | The fare basis code for this flight leg. |
| FlightNumber | The flight number of the flight. This is required for use with scheduled airline messages but may be omitted for requests by tour operators.Identifies a flight number (1 to 4 numbers followed by optional uppercase A - Z, which specifies an operational suffix) or OPEN or ARNK. |
| FlownMileageQty | The quantity of flown miles associated with this segment. |
| GovernmentApprovalInd | When true, indicates that the flight is subject to government approval. |
| GovernmentApprovalText | Provides additional information concerning the flight being subject to government approval. |
| InfoSource | Used to specify the source of the data being exchanged as determined by trading partners.Used to specify the source of the data being exchanged. |
| LineNumber | A number that corresponds to a line in a previous response of flight segments. |
| MealCode | The applicable meal service code for this flight.Enumerated List (Meal Code in brackets): Breakfast (B); Snack (S); Dinner (D); Hot Meal (H); Lunch (L); Refreshments (R); Complimentary Liquor (C); Meal (M); Liquor for Purchase (P); Food for Purchase (F); Cold Meal (O); No Meal Service (-). Alternately, a String of Length 32 can be used if the above list does not suffice. |
| NumberInParty | Number of travelers associated with this segment. |
| ParticipationLevelCode | To specify the level of participation by a vendor in another system. Refer to OpenTravel Code List Participation Level Code (PLC). |
| ResBookDesigCode | Specific Booking Class for this segment.Used for an Alpha String, length 1 to 2 (for letter codes). |
| RPH | Reference place holder for this flight segment. |
| Status | Code providing status information for this segment. Refer to OpenTravel Code List Status (STS). |
| StopoverInd | When true a stopover is permitted (airline display "O"). When false a stopover is not permitted (airline display "X"). |
| StopQuantity | The number of stops the flight makes. |
| TourOperatorFlightID | ID of a flight in the Tour Operator's inventory. This flight is not necessarily in the inventory of an airline. Rather, it is a code created by tour operators. |
| ValidConnectionInd | When true, this flight segment constitutes a valid connection. |