A ticket number is issued for each customer at the time of purchase. It is one of the authentication codes used to identify the ticket and determine if you are the ticketed passenger when checking in and boarding, making changes that result in a different fare amount, or obtaining a refund. It consists of 13 digits (0-9).
Ticket numbers are required for all customers for these types of transactions.
On the purchase completion page, in the purchase completion e-mail or text, or on the e-ticket itinerary/receipt.
You can also search for it on the e-Ticket Search page.
On the e-ticket itinerary/receipt.