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 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 Calculate Air Mileage (MileageLLSRQ) API is used to compute air routing mileage.

The Calculate Carbon Emissions (Carbon_CalculatorRQ) (CO2) API is used to calculate the approximate amount of carbon burned in kilograms per person, per all persons, and per each segment, during air travel, hotel, or car hire.

The Cancel Air Seat (AirSeatCancelLLSRQ) is used to cancel a previously reserved seat for a selected itinerary segment.

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