| AirItinerary | The air itineraries to be priced.Specifies the origin and destination of the traveler. |
 OriginDestinationInformation | Information on the locations between which availability is to be checked.Origin and Destination location, and time information for the request. Also includes the ability to specify a connection location for the search. |
| PromotionInfo | Promotion code pertaining to this portion of the search. |
| SpecificFlightInfo | Information used to specify a flight for which availablity is to be checked.Specify actual airline, flight number, or booking class |
| 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. |
| TravelPreferences | Air Availability Request preference information.Defines user preferences to be used in conducting a search. |
| TravelRefSummary | Used to specify passenger and fare information for which availablity is to be checked.Contains references to the DynamicPkgGuest the air search is for. |