The Add Accounting Line (AddAccountingLineLLSRQ) service is used to add manual accounting lines to the Passenger Name Record (PNR).

The Add Arrival Unknown Segment (ARUNK_LLSRQ) service is used to add arrival unknown segments (ARUNK) into the passenger name record (PNR).

The Add Itinerary Info (TravelItineraryAddInfoLLSRQ) service is used to add basic passenger-related content into a Passenger Name Record (PNR).

The Add Itinerary Remark (AddRemarkLLSRQ) service is used to enter information into the remarks section of a Passenger Name Record (PNR).  

The Add Special Service (SpecialServiceLLSRQ) service is used to send a wide variety of teletype messages to carriers.

The Air Availability (OTA_AirAvailLLSRQ) API is used to search for flights and the corresponding class availability information for a given origin, destination, and travel date.

The Book Air Segment (OTA_AirBookLLSRQ)API  is used to book one or more flight segments.

The Book From Air Availability (ShortSellLLSRQ) API is used to short sell direct access airline flight segments from an air availability response.

The Build Invoice And Itinerary (InvoiceItineraryLLSRQ) service is used to generate invoices and itineraries.  

The Cancel Itinerary Segments (OTA_CancelLLSRQ) API is used to cancel itinerary segments contained within a passenger name record (PNR).

The Create Itinerary (createReservationRQ) API is used to create a Passenger Name Record (PNR) and create an itinerary with tour and rail segments.

Create Passenger Name Record (CreatePassengerNameRecordRQ) is an orchestrated API that bundles several functions and operations into a single call. This API specifically provides the capability to create a Passenger Name Record (PNR), including air segments, in a single call.

The Create PhaseIV Ticket Record (PhaseIVAddInfoLLSRQ) service is used to create a Phase IV ticket record, which is used for manual pricing.