Amadeus SI Command: ARNK & Information Segments

A complete guide to the SI command in Amadeus — how to create an arrival-unknown (ARNK) segment or an information segment in a PNR.

SI is the Amadeus GDS command used to create an arrival-unknown segment or an information segment in a PNR.

Category: PNR Segments.

It is used when the arrival flight is unknown or when you need to add flight information to the PNR without creating a confirmed air segment.

The two uses of SI are different but related. An ARNK segment marks a surface portion of the journey — a gap where no flight is booked. An information segment records flight details for reference without creating a bookable air segment. For a detailed guide to ARNK in Amadeus, Sabre, and Galileo, see the dedicated article on how to use ARNK.

Create an arrival unknown segment:

SIARNK

This creates an ARNK segment that marks a surface portion of the itinerary — a gap where the passenger is travelling by another means, such as driving or taking a train between two cities.

Create an ARNK segment with a specific date:

SIARNK8MAY

This creates an arrival unknown segment dated 8 May, so the surface portion is placed on the correct day in the itinerary.

Create an information segment for a specific flight:

SIKL171C28JUNAMSCPH

This creates an information segment for KLM flight KL171 on 28 June from AMS to CPH. The segment records the flight details in the PNR as information — it does not create a confirmed, bookable air segment.

Use this when the passenger is travelling on a flight that was booked elsewhere, or when the flight details need to be visible in the PNR for reference, but you do not want a live booking that requires ticketing or that would affect the fare calculation.

Use SI when the passenger’s arrival information is unknown, or when flight details need to be recorded in the PNR as information rather than as a confirmed flight segment. Typical scenarios include:

• A passenger driving or taking a train between two cities in the itinerary.
• A surface sector where no flight is booked — for example a ferry crossing.
• A gap in the itinerary where the arrival flight is unknown at the time of booking.
• Recording a flight booked directly with the airline or through another channel.
• Adding flight information for reference without creating a confirmed air segment.
• Documenting a low-cost carrier flight that is not available in Amadeus.
• Marking a surface portion of the journey so the fare can be calculated correctly across the whole route.

A typical session using SI might look like this:

• Retrieve the PNR with RT and identify the missing or surface portion of the journey.
• Confirm with the customer how they are travelling on that portion — driving, train, ferry, or a flight booked elsewhere.
• Enter SIARNK or SIARNK8MAY for a surface sector, or SIKL171C28JUNAMSCPH for an information segment.
• Verify the segment appears correctly in the itinerary with RTIM.
• Check for married segments if the itinerary is complex.
• Price the itinerary with FXP to ensure the fare calculation recognises the segment correctly.
• Save the change with ER or ET.

• SI → creates an ARNK segment or an information segment.
• SS → sells confirmed flight segments from availability.
• AU → creates an air taxi auxiliary segment.
• HU → creates a hotel auxiliary segment.
• CU → creates a car rental auxiliary segment.
• RU → creates a memo auxiliary segment.
• DL → deletes a segment with an inactive status code.
• XE → cancels individual PNR elements including segments.
• RH → displays the PNR history, including SI segments.

The distinction matters: SS sells a bookable flight segment; SI creates an ARNK or information segment that is not a confirmed booking. Use SI when there is no bookable flight to add.

Important: ARNK segments must be placed correctly in the itinerary to ensure the fare calculates properly. If the ARNK is placed in the wrong position, the pricing may fail or return an incorrect fare.

Always verify the segment using RTIM and reprice with FXP after adding an SI segment, particularly for itineraries that require complex fare construction.

What does the SI command do in Amadeus?

SI creates an arrival-unknown (ARNK) segment or an information segment in a PNR.

What does SIARNK mean?

It creates an arrival-unknown segment, which marks a surface portion of the journey where no flight is booked.

What does SIKL171C28JUNAMSCPH mean?

It creates an information segment for KLM flight KL171 on 28 June from Amsterdam (AMS) to Copenhagen (CPH), recording the flight as information only.

Does SI create a bookable flight segment?

No. SI creates an informational segment. Use SS to sell a confirmed, bookable flight segment.

Where can I read more about ARNK?

See the dedicated guide on how to use ARNK in Amadeus, Sabre, and Galileo.

• SI command
• Amadeus SI
• ARNK segment Amadeus
• arrival unknown segment
• SIARNK
• SIARNK8MAY
• information segment Amadeus
• SIKL171C
• SS command
• how to use ARNK