PITTSBURGH -- Most people don't know it, but there is a way to save money on airline tickets even after you bought them.

Have you bought a ticket only to find out it went on sale for less a few days later?

Now there is a way to keep track of dropping ticket prices and even get something back when you pay too much.

Robert Morris University professor Denis Rudd said, “In some cases an airline is willing to give you money back. It's called a rollover or vouchers, if you paid too much for your ticket.”

Rudd said airlines have been doing it for years. “Nobody knew about it, nobody knew how to do it, now all of a sudden people are going to know about it,” he said.

That's because of a new Web site called yapta.com.

To get the rebate, you have to call the airline while the lower price is still in effect.

Finding out that price information was tough, until yapta.com was formed. It's simple to use; just sign up and enter your trip information.

Rudd said, “You have an option to tag a specific flight and that flight, every day will send you information about the price of the flight.”

This allows you to keep track of your ticket prices daily.

Yapta.com lets you know immediately if the price drops.

That's when you call the airline.

Every airline has a different policy. Some give money back and some give credit for future flights or vouchers for hotels, so you need to check your airline out.

There is one thing for which to watch out for; some airlines charge a fee to reissue tickets and that fee may be higher than the credit you're getting.

For more information visit www.yapta.com.