Amadeus TTH Command: Display TST History Guide

A complete guide to the TTH command in Amadeus — how to display the history of a TST and review every change made to the ticket record.

A TST — Transitional Stored Ticket — does not stay static. Every time you reprice, update the fare, add taxes, change the form of payment, or reissue, the TST is modified, and each modification is recorded. The TTH command is how you read that record. It displays the history of a TST, showing what was changed and when, so you can verify a pricing update, trace an error, or confirm that a reissue was processed correctly. This guide explains what TTH does, the syntax for each variation, and when it is the right command for the job.

What Does the TTH Command Do?

TTH is the Amadeus GDS command used to display the history of a TST (Transitional Stored Ticket).

Category: TST / Ticketing.

The TTH entry allows you to review changes made to a TST, either for the only existing TST, a specific TST, or a specific section of TST history.

This makes TTH a diagnostic command as much as a reporting one. When a fare does not look right, when taxes change unexpectedly, or when a reissue produces an unexpected amount, the TST history usually explains why.

Display History of the Only TST

Enter the command on its own when the PNR contains a single TST:

TTH

This requests the TST history when only one TST exists, displaying all recorded changes for that record.

Display History of a Specific TST

When the PNR contains multiple TSTs, specify which one you want to review:

TTH/T2

This requests the history for TST 2. This is essential in multi-passenger PNRs where adults and children have separate TSTs, or where an itinerary has been split across two ticket records. For more on passenger types, see How to Add Passenger Types in Galileo GDS.

Display a Specific Section of TST History

To narrow the display to one section of the history, add the section indicator:

TTH/T2A

This requests a specific section of TST 2 history. It is useful when the history is long and you only need to review a particular part of the record — for example, the fare section or the tax section.

Simulated TTH Output Example

The example below shows what a typical TTH display looks like — a TST that was created, then updated with a fare correction, a tax adjustment, and finally cleared of the change flag:

AMADEUS · TTH DISPLAY

TST 00001   CAI1A0980  AA/1 1CAI1A0980  Y  NUC675.00  END
─────────────────────────────────────────────────────────
HISTORY  TST 00001
─────────────────────────────────────────────────────────
07SEP 09:14  CREATED      TST created for PAX 1.1
07SEP 09:14  FARE         F EGP 675
07SEP 09:14  TAX          TX001 X  EGP 30
07SEP 09:14  TAX          TX002 YQ EGP 250
07SEP 09:14  TOTAL        EGP 955
07SEP 09:14  FOP          CASH
07SEP 09:14  FB           YR4M

07SEP 10:02  TTK/F        FARE CHANGED  EGP 675 → EGP 700
07SEP 10:02  FLAG SET     PNR change flag applied

07SEP 10:15  TTK/X3       TAX CHANGED   TX002 YQ  EGP 250 → EGP 280
07SEP 10:15  TOTAL        EGP 955 → EGP 1010
07SEP 10:15  FLAG SET     PNR change flag re-applied

07SEP 10:20  TTH          HISTORY REVIEWED
07SEP 10:30  TTF          FLAG CLEARED  PNR change flag removed
07SEP 10:30  TST          TST now clean — ready for ticketing

Reading the TTH output:

Date & time — when each change was made.
Action code — what triggered the change (e.g., TTK/F, TTK/X3, TTF).
Description — the field that was changed and the before/after values.
Flag status — whether the PNR change flag was set or cleared.
Final state — confirms when the TST is clean and ready for issuance.

When to Use TTH

Use TTH when you need to review the history and changes made to a TST, including changes to specific TST records or sections. Typical scenarios include:

Verifying that a fare update was applied correctly.
Investigating why a tax amount changed between pricings.
Confirming that a reissue updated the TST as expected. See Reissue vs Revalidation for how airlines treat revalidated tickets.
Checking which agent or process modified a TST and when.
Reviewing a specific section of the TST without reading the whole history.

How TTH Fits Into Your Ticketing Workflow

A typical ticketing session using TTH might look like this:

Retrieve the PNR and display the TST with TQT or TQTC.
Spot an unexpected fare, tax, or penalty amount.
Enter TTH, TTH/T2, or TTH/T2A to review the history.
Identify the change that caused the issue.
Correct the TST with TTK or TTI if needed.
Clear the change flag with TTF and confirm the correction with TTH again.

💡 Tip: If you are new to Amadeus ticketing, start with How to Create a PNR in Amadeus and Amadeus Lesson 5 — How to Price a Booking before using TTH for diagnostics.

Explore the related Amadeus TST commands below to complete your display and ticketing toolkit:

Amadeus Command

TQT — Display TST

View the current TST record in formatted mode.

Amadeus Command

TQTC — Cryptic TST

View the TST in cryptic command-line format.

Amadeus Command

TTC — Manual TST

Create the TST that TTH will track.

Amadeus Command

TTK — Update TST

Change fare, tax or totals — recorded in TTH.

Amadeus Command

TTI — Update Validity

Change validity, baggage and fare basis — tracked in TTH.

Amadeus Command

TTF — Remove Change Flag

Clear the flag that TTH shows was set.

For a deeper dive into related ticketing tasks, see:

TTP — Issue Ticket — issue the ticket after the TST is clean.
Void in Amadeus System — simple guide for travel agents.
How to Process a Manual Refund in Amadeus — step-by-step guide.
Displaying Ticket Conditions & Penalties in Amadeus — check fare rules before issuing.
Amadeus Lesson 9 — How to Issue a Ticket — full issuance walkthrough.

Troubleshooting Common TTH Errors

If TTH returns an error or an unexpected result, the issue is usually one of the following. Work through them in order:

No TST Exists in the PNR

TTH needs an existing TST to display history for. If the itinerary has never been priced or the TST was deleted, TTH has nothing to show.

👉 Price the itinerary first with FXP, or create a manual TST with TTC.

No PNR Is Currently Retrieved

TTH operates on the PNR open in your workspace. If no PNR is retrieved, the entry returns an error.

👉 Retrieve the PNR with RT or REC before running TTH. See RT — Retrieve PNR for more details.

Invalid TST Number

If you entered TTH/T3 but only 2 TSTs exist, the entry will fail.

👉 Display the TST list first with TQT to confirm which TST numbers exist, then retry TTH.

Invalid Section Indicator

If TTH/T2A returns no data, the section code may not match the structure of that particular TST.

👉 Run the full TTH/T2 first to see all available sections, then narrow down.

No History Because the TST Was Just Created

A newly created TST may have a very short history — just the creation entry.

👉 This is not an error. As further edits are made with TTK, TTI, or TTF, the history will grow.

Frequently Asked Questions

What does TTH/T2 mean?

It displays the history of TST 2 in the PNR, showing all recorded changes made to that specific TST.

What is the difference between TTH and TQT?

TQT displays the current TST contents. TTH displays the history of changes made to the TST over time.

When should I use TTH/T2A instead of TTH/T2?

Use TTH/T2A when you only need one section of TST 2 history rather than the full record — useful when the history display is long.

Does TTH change anything in the TST?

No. TTH is a read-only display. It only shows history — nothing is modified by running the command.

Why does TTH show a change I did not make?

Changes are recorded with their action code and timestamp. If a change appears unfamiliar, review the action code against the command family (TTK, TTI, TTF) and cross-check with TQT.

Can TTH help prevent ADMs?

Yes. By reviewing the TST history before issuing with TTP, you can catch incorrect fare or tax changes that would otherwise be silently carried into the ticket and later billed as an Agency Debit Memo (ADM).

Conclusion

The TTH command gives you full visibility over the changes made to a TST in Amadeus. Whether the PNR holds a single TST or several, TTH lets you review the complete history or drill into a specific TST record or section. Use TTH for the only existing TST, TTH/T2 for a specific TST, and TTH/T2A for a specific section. Reviewing the TST history is the fastest way to confirm pricing updates, trace fare and tax changes, and verify that reissues were processed correctly — making TTH an essential tool for accurate ticketing. Paired with TQT, TTK, TTI, and TTF, TTH completes the TST toolkit and ensures every ticket record is verified before issuance.

Keep exploring: For a complete view of Amadeus ticketing, pair this guide with Adding Form of Payment & Commission, How to Issue EMD Services, and Amadeus Queues — How to Use Them Efficiently.

🔖

Save This TTH Guide for Ticketing Diagnostics

TTH is the diagnostic tool you reach for whenever a TST looks wrong. Bookmark this page — and explore our other TST command guides — so the display example, troubleshooting steps and companion commands are always one click away.

TQT — Display TST TTK — Update TST TTF — Remove Change Flag

Press Ctrl + D (Windows) or ⌘ + D (Mac) to add it to your bookmarks.