What does HK mean in a flight booking?

HK stands for Holds Confirmed, a GDS status code indicating that an airline has accepted and confirmed a flight segment. It means a seat is reserved in the airline's inventory for the passenger. HK does not mean a ticket has been issued; ticketing is a separate step that must occur before the airline's deadline to avoid automatic cancellation.

Is an HK status the same as having a ticket?

No. HK confirms a seat is held, but the booking remains unticketed until payment is processed and the 13-digit e-ticket number is generated. A segment can sit in HK status for hours or days before ticketing occurs. If the ticket isn't issued before the airline's time limit, the segment is cancelled automatically.

What happens if an HK booking is not ticketed on time?

The airline cancels the segment and changes its status from HK to HX (cancelled by carrier). The seat returns to open inventory and may sell to another passenger. The traveler must rebook, often at a higher fare. Navan automates ticketing upon confirmation to prevent time-limit cancellations in corporate travel programs.

How does HK differ from KK status in a GDS?

HK indicates the GDS or agency holds a confirmed segment after sending a sell request. KK means the airline proactively confirmed the segment, typically in response to a schedule change or when the carrier updates a previously pending request. Both represent confirmed seats, but they reflect different confirmation pathways.

Can an airline cancel a segment that shows HK status?

Yes. Airlines cancel HK segments in two scenarios: when the ticketing time limit expires without an issued ticket, or when the airline initiates an involuntary schedule change that fundamentally alters the flight. In both cases the status changes to HX or XX, and the agency or platform receives a notification to rebook.

What GDS systems use the HK status code?

All major Global Distribution Systems use HK as the standard confirmation code: Amadeus, Sabre, and Travelport (which includes Galileo and Apollo). The code is standardized through IATA's AIRIMP procedures, so it means the same thing regardless of which GDS processes the booking.

How does Navan handle HK confirmations for corporate bookings?

Navan receives HK confirmations from airlines in real time and moves bookings through automated ticketing workflows, issuing e-tickets within the carrier's required time window. This prevents the silent cancellations that occur when unticketed HK segments expire, and it syncs confirmed bookings to the expense system immediately for finance team visibility.

What is HK (Holds Confirmed)? GDS Guide

HK (Holds Confirmed)

A two-letter segment status code used in Global Distribution Systems indicating that an airline has confirmed a requested flight reservation, meaning the seat is held in inventory and the booking is ready for ticketing.

Victoria Landsmann

•June 25, 2026•

5 minute read

Key Takeaways

HK is a two-letter status code in Global Distribution Systems meaning "Holds Confirmed," indicating that an airline has accepted and confirmed a flight segment in a Passenger Name Record. It is the most common confirmation status a travel agent or booking platform receives after selling a seat.

HK confirms that the airline's inventory system has reserved the requested seat and class of service for the passenger, but it does not mean a ticket has been issued [1].
Bookings in HK status are subject to ticketing time limits: if the ticket isn't issued before the deadline, the GDS automatically cancels the segment, returning it to HX (cancelled by carrier) status [2].
The IATA Airline Industry Reservations Interline Message Procedures (AIRIMP) standardize HK and approximately 50 other status codes used across all major GDS platforms and airline reservation systems worldwide [1].
Navan processes HK confirmations in real time, moving bookings through the ticketing workflow automatically so corporate travelers don't risk losing confirmed segments to time-limit expirations.
Travel managers monitoring unticketed PNRs in HK status can identify booking-to-ticket gaps that represent fare risk, since airlines may cancel unticketed segments after 24-72 hours depending on fare rules.

What is HK (Holds Confirmed)?

HK (Holds Confirmed) is a segment status code used in Global Distribution Systems to indicate that an airline has confirmed a requested flight reservation. When a travel agent, corporate booking tool, or automated system sells a seat, the airline's reservation system responds with HK to confirm that the inventory has been decremented and the segment is held for that passenger.

The code appears within the Passenger Name Record (PNR) attached to each air segment. A PNR with all segments showing HK status means every flight leg is confirmed and the itinerary is ready for ticketing. HK is distinct from ticketing: a segment can sit in HK status for hours or days before the actual e-ticket is issued, depending on fare rules and agency workflows.

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How Does the HK Status Code Work in a Booking?

The HK code is part of a larger system of approximately 50 segment status codes defined by IATA's AIRIMP standards [1]. These codes communicate the state of every flight segment between airlines, GDS platforms, and booking tools.

When a booking request enters the system, the following sequence occurs:

The agent or platform sends a sell request to the airline through the GDS, specifying flight number, date, class of service, and number of seats.
The airline's reservation system checks inventory for the requested class.
If seats are available, the system responds with HK, confirming the hold.
If seats are unavailable, the system returns alternative codes: HL (waitlisted), UC (unable to confirm), or UN (unable, no flight).

A corporate booking platform like Navan completes this entire exchange in seconds. The traveler sees "Confirmed" in the interface while the underlying system records the HK status in the PNR for downstream processing.

Common GDS Status Codes Compared to HK

Understanding HK requires context among related status codes. Travel managers and agents encounter these most frequently:

Code	Meaning	Implication
HK	Holds Confirmed	Segment confirmed, ready for ticketing
HL	Holds Waitlist	Segment waitlisted, not confirmed
HN	Holds Need	Request sent, awaiting airline response
KK	Carrier Confirmed	Airline proactively confirmed the segment
TK	Schedule Change (confirmed)	Time changed on a confirmed segment
HX	Cancelled by Airline	Carrier cancelled the segment (often due to no ticket)
UN	Unable	Flight unavailable or cancelled
UC	Unable to Confirm	Cannot confirm or waitlist

The practical distinction that matters for corporate travel programs: HK means "proceed to ticketing." Any other status requires action, whether waiting for confirmation, rebooking, or investigating a schedule change.

Why HK Status Matters for Corporate Travel Management

For travel managers overseeing a managed travel booking program, HK status serves as the reliability signal in three operational areas.

Ticketing time-limit management. Airlines impose ticketing deadlines on HK segments. A booking confirmed at HK on Monday might require ticketing by Wednesday. If the deadline passes without a ticket, the airline cancels the segment (status changes to HX) and releases the seat back to inventory [2]. Corporate programs that process hundreds of bookings weekly need automated monitoring of these deadlines. Navan tracks ticketing time limits and processes tickets within the required window, preventing silent cancellations that leave travelers without confirmed flights.

Duty-of-care visibility. Travel risk management systems use HK-status PNRs to track where employees are traveling. A segment in HK represents a confirmed commitment to a specific flight, which feeds traveler location data for security monitoring. Segments in pending states (HN, HL) don't provide the same level of certainty for duty-of-care purposes.

Spend forecasting accuracy. Finance teams projecting travel costs rely on confirmed bookings. Segments in HK status represent committed spend against a fare that has been locked. Segments in other states may never convert to tickets, making them unreliable for budget forecasting.

What Happens After a Segment Reaches HK Status?

The HK confirmation initiates a defined workflow within the booking lifecycle. Once all segments show HK, the e-ticket issuance process begins:

The GDS or booking platform calculates the fare based on the confirmed routing and class of service.
A Transitional Stored Ticket (TST) is created, capturing the price, taxes, and fare rules.
The ticket is issued, generating the 13-digit e-ticket number that becomes the financial record of the transaction.
The PNR updates to reflect the ticketed status, and the booking syncs to the corporate expense system.

If the ticketing step fails or is delayed past the airline's time limit, the consequences are immediate. The segment drops from HK to HX, the seat returns to open inventory, and the fare may no longer be available at the same price. For business travelers with tight schedules, this can mean rebooking at a higher fare or losing access to the preferred flight entirely.

Best Practices for Managing HK Confirmations

Travel programs that minimize booking failures follow three operational patterns around HK status management.

Automate ticketing workflows. Manual ticketing queues create risk. When agent-assisted bookings sit in HK status waiting for human intervention, time-limit expirations become a recurring source of rebooking costs. Automated ticketing upon HK confirmation eliminates this gap.

Monitor unticketed HK segments daily. A queue report showing all PNRs in HK status without issued tickets highlights exposure. Sort by ticketing deadline to prioritize action.

Understand carrier-specific time limits. Airlines set different ticketing deadlines depending on fare class, route, and sales channel. Low-cost fares on competitive routes may require ticketing within hours. Premium fares on long-haul routes typically allow 24-72 hours. GDS systems return these deadlines in the booking response.

Sources

[1] IATA, "Airline Industry Reservations Interline Message Procedures (AIRIMP)," 49th Edition, effective June 1, 2025 - May 30, 2026. https://www.iata.org/en/publications/manuals/airline-industry-reservations-interline-message-procedures-airimp/

[2] Travelport, "Universal API: Air Status Codes," 2025. https://support.travelport.com/webhelp/uapi/Content/Air/Shared_Air_Topics/PNR_Status_Codes.htm

Passenger Name Record (PNR): The master booking record containing traveler details, itinerary segments, and status codes including HK for confirmed flights.
Global Distribution System (GDS): The technology network connecting booking tools to airline inventory where HK confirmations are exchanged.
Electronic Ticket: The financial document issued after an HK-confirmed segment passes through the ticketing process.
Airline Reservation System (ARS): The airline-owned platform that processes sell requests and returns HK or alternative status codes.

Frequently Asked Questions About HK (Holds Confirmed)

HK stands for Holds Confirmed, a GDS status code indicating that an airline has accepted and confirmed a flight segment. It means a seat is reserved in the airline's inventory for the passenger. HK does not mean a ticket has been issued; ticketing is a separate step that must occur before the airline's deadline to avoid automatic cancellation.
No. HK confirms a seat is held, but the booking remains unticketed until payment is processed and the 13-digit e-ticket number is generated. A segment can sit in HK status for hours or days before ticketing occurs. If the ticket isn't issued before the airline's time limit, the segment is cancelled automatically.
The airline cancels the segment and changes its status from HK to HX (cancelled by carrier). The seat returns to open inventory and may sell to another passenger. The traveler must rebook, often at a higher fare. Navan automates ticketing upon confirmation to prevent time-limit cancellations in corporate travel programs.
HK indicates the GDS or agency holds a confirmed segment after sending a sell request. KK means the airline proactively confirmed the segment, typically in response to a schedule change or when the carrier updates a previously pending request. Both represent confirmed seats, but they reflect different confirmation pathways.
Yes. Airlines cancel HK segments in two scenarios: when the ticketing time limit expires without an issued ticket, or when the airline initiates an involuntary schedule change that fundamentally alters the flight. In both cases the status changes to HX or XX, and the agency or platform receives a notification to rebook.
All major Global Distribution Systems use HK as the standard confirmation code: Amadeus, Sabre, and Travelport (which includes Galileo and Apollo). The code is standardized through IATA's AIRIMP procedures, so it means the same thing regardless of which GDS processes the booking.
Navan receives HK confirmations from airlines in real time and moves bookings through automated ticketing workflows, issuing e-tickets within the carrier's required time window. This prevents the silent cancellations that occur when unticketed HK segments expire, and it syncs confirmed bookings to the expense system immediately for finance team visibility.