| Segment | Ebene | Beschreibung | Opt/Mand. |
|---|
| UIH | 0 | A service segment starting and uniquely identifying a message. The message type code for the Availability request - interactive message is AVLREQ. Note: Availability request - interactive messages conforming to this document must contain the following data in segment UIH, composite S306: Data element 0065 AVLREQ D A UN | Mandatory |
| MSD | 0 | A segment identifying the industry type (i.e. air, car, train, accommodations, etc.) and business function of the message. | Optional |
| ORG | 0 | A segment providing data pertaining to the originator of the interactive request (i.e. travel agent identity and location and the commercial computer reservations system delivering the message). | Optional |
| PDT | 0 | A segment to indicate a class of service for which availability is requested. | Optional |
| NUN | 0 | Number and identifying qualifier to indicate number of adults or children pertaining to the entire request. | Optional |
| RPI | 0 | A number to indicate how many units of the product is needed to be available. | Optional |
| FTI | 0 | Frequent traveller program information relating to the entire Travel, Tourism and Leisure (TT&L) availability request (frequent flier number). | Optional |
| CRI | 0 | Consumer reference information relating to the entire TT&L availability request (corporate discount number, personal profile number). | Optional |
| ITM | 0 | Numbers assigned to information in the previous response which may be used to make a request without repeating all the information. | Optional |
| PLI | 0 | A segment to indicate the location by geographic area, reference point, or direction for which an available product is requested. | Optional |
| PMT | 0 | Payment information which may be used to determine if a product is available. | Optional |
| SDT | 0 | Information pertaining to the entire request to specify special criteria for selecting products that are available. | Optional |
| NME | 0 | To specify additional originator information that may be used to determine what products are available. | Optional |
| RTC | 0 | To indicate the rate codes for which availability is requested. | Optional |
| HDI | 0 | Information specifying terminal equipment addresses and device types. This information may be used for tracing and security purposes. | Optional |
| RCI | 0 | To specify the reservation confirmation number of a previous booking. | Optional |
| TDI | 0 | To specify a driver's license information that may be necessary to determine if a product rate is available. | Optional |
| POS | 0 | To specify the point of sale to determine the rate to provide. | Optional |
| CON | 0 | A segment to indicate the phone number of a hotel property(s) for which availability is requested. | Optional |
| TFF | 0 | Tariff information relating to the entire TT&L availability request. | Optional |
| SG1 | 0 | SG1 | Optional |
| SSR | 1 | Details pertaining to special services or special requests to determine the criteria for selecting available products. | Mandatory |
| IFT | 1 | Details in free text form pertaining to special services or requests to determine the criteria for selecting available products. | Optional |
| CUR | 0 | To specify the currency when requesting products within a certain price range. | Optional |
| RUL | 0 | To specify rules that may affect the availability request. | Optional |
| ADS | 0 | A segment to indicate the address of a hotel property(s) for which availability is requested. | Optional |
| SG2 | 0 | SG2 | Optional |
| TVL | 1 | Information identifying the TT&L product or service (service provider, service location, date of service, service description, etc.). | Mandatory |
| PRD | 1 | The identification of a specific product or service and the level or type of service. | Optional |
| ITM | 1 | Numbers assigned to information in the previous response which may be used to make a request without repeating all the information. | Optional |
| TFF | 1 | Tariff information relating to a particular product or service. | Optional |
| APD | 1 | Supplementary services required of a particular product or service. | Optional |
| SG3 | 1 | SG3 | Optional |
| NUN | 2 | To specify the number of adults and children. | Mandatory |
| CRI | 2 | To specify the ages of the travellers for whom availability is requested. | Optional |
| SG4 | 0 | SG4 | Optional |
| TIF | 1 | Details pertaining to a traveller or traveller group (surname, group name, given name, adult, child, etc.). | Mandatory |
| FTI | 1 | Frequent traveller program information pertaining to a specific traveller. | Optional |
| SSR | 1 | Details pertaining to special services or special requests for a specific traveller. | Optional |
| SG5 | 0 | SG5 | Optional |
| RTI | 1 | To specify rate categories, such as, standard, promotional, as criteria for availability selections. | Mandatory |
| RTC | 1 | To specify the rate codes related to the previous rate categories. | Optional |
| SG6 | 0 | SG6 | Optional |
| MOV | 1 | Information pertaining to the delivery of an automobile or chauffeur instructions. | Mandatory |
| ADS | 1 | The address to where the car needs to be delivered. | Optional |
| CON | 1 | To specify contact information for the delivery of an automobile. | Optional |
| PLI | 1 | To specify the location and purpose of the chauffeur requested. | Optional |
| SG7 | 0 | SG7 | Optional |
| ODI | 1 | A segment providing the origin and destination of a TT&L journey. | Mandatory |
| MSD | 1 | A segment identifying the industry type (i.e. air, car, train, accommodations, etc.). | Optional |
| PDT | 1 | To specify the class of service for which availability is requested. | Optional |
| SG8 | 1 | SG8 | Optional |
| TVL | 2 | Information identifying the product or service (service provider, service location, date of service, service description, etc.). | Mandatory |
| PDT | 2 | To specify the class of service requested for a particular product or service. | Optional |
| RPI | 2 | To indicate the number of products or services which needs to be available. | Optional |
| FTI | 2 | Frequent traveller program information relating to a specific product or service. | Optional |
| SSR | 2 | Information about special services or special requests relating to the product or service. | Optional |
| CNX | 2 | Connection information for a specific product or service. | Optional |
| SG9 | 2 | SG9 | Optional |
| TIF | 3 | Personal details pertaining to a unique traveller or traveller group. | Mandatory |
| FTI | 3 | Frequent traveller program information relating to the preceding traveller. | Optional |
| SSR | 3 | Details pertaining to special services or special requests for the preceding traveller. | Optional |
| UIT | 0 | A service segment ending a message, giving the total number of segments in the message (including the UIH & UIT) and the control reference number of the message. | Mandatory |
