What are the dimensions of a standard airline ticket?

I'm making travel wallets for myself and a group of friends who are going to Puerto Rico in June and I want to make sure that the opening for the airline tickets is large enough. Does anyone know what the dimensions of an airline ticket are?

Standard dimension is 3 1/4 inch by 8 inch. But if were you, I would make it big enough for standard 8 1/2 by 11 inch printout fold by 1/3 because of eTickets (multiple pages).

Now, if you going to make one, you might want to make multiple pockets for tickets, boarding passes (used ones), passport, declaration forms, etc.