E-ticket
US /ˈiːˌtɪkɪt/
UK /ˈiːˌtɪkɪt/

1.
an electronic ticket, especially for air travel, which is stored in a computer and can be printed out by the customer
:
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I received my e-ticket for the flight via email.
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You just need to show your e-ticket at the check-in counter.