Why haven’t I been charged for my honeymoon flight?

Here’s a question that came to me by way of the Monday afternoon Washington Post chat on travel (and by the way, if you haven’t dropped in to ask a question, please do). Karen Luong booked her honeymoon flights from Baltimore to Naples, Italy through Orbitz in mid-June. She received reservation number from the online agency, but hasn’t been charged yet.

How can she be sure she has a ticket?

This is a question that’s come up a time or two. What, exactly, is a ticket? Is it a record locator? A ticket number? A reservation number for your online travel agency?
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