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In short, it is a record of the fare, pricing, and payment information for the ticket. For example, if the itinerary is repriced, the PNR would not change, but a new TST would be created.
According to this 2009 Amadeus TST Training Manual,
A Transitional Stored Ticket (TST) is a record created to store information that is printed on a passenger ticket. The system creates the TST automatically after you make an itinerary pricing entry, FXP (FXB, FXA β¦) The TST is attached to the PNR and can be viewed as required. A maximum of ten TSTs can be stored per passenger.
When you enter a request to display a stored TST, the system combined information contained in the PNR and the tst.The following information is stored in a TST only:
- International sales indicator
- Origin/destination
- Fare basis/Ticket designator
- Not-valid-before and not-valid-after dates
- Baggage allowance
- Fare including currency code
- Equivalent fare including currency code
- Tax including currency code, country tax code, and tax type code
- Net Fare (Net Remit Ticketing)
- Fare calculation
- Banker' selling rate
- Additional Banker' selling rate
- Payment restrictions
The following fare element information is stored both in the PNR and in the TST
- Ticketing carrier
- Commission
- Tour code
- Form of payment
- Endors*m*nt
- Original issue/in exchange
As outlined in the Amadeus e-University blog:
A stored fare, also known as a Transitional Stored Ticket (TST), is a record of all fare information for a PNR. The TST is created after you make an entry to price and store the fare, or when you issue a ticket or invoice. When a TST is created a number is allocated to that specific TST which is completely unique and cannot be re-used within the same PNR. This number allows you to identify the TST for the entire life of the PNR.