| CustLoyalty | A frequent renter number associated with the reservation. |
| PersonName | A name by which the reservation may be identified.This provides name information for a person. |
| 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. |
 UniqueID | A unique identifier to reference a reservation, such as a reservation number or customer ID. May also be used to pass the IATA agency number.An identifier used to uniquely reference an object in a system (e.g. an airline reservation reference, customer profile reference, booking confirmation number, or a reference to a previous availability quote). |