Thanksgiving week forecast: Snow and winter storms may hit several states amid holiday travel crush

A record-breaking number of people are expected to fly this holiday season, with the Transportation Security Administration (TSA) projecting it will screen 18.3 million people during Thanksgiving week alone.

If you’re one of the millions of people traveling during this busy time, here’s a quick guide to what you should keep in mind — from when to expect a refund for a canceled flight to how to deal with potentially lost luggage.

When are you entitled to a flight refund?

According to the Department of Transportation’s (DOT) new “Automatic Refund” rule, you’re entitled to a refund if:

• Your flight is canceled and the airline does not rebook you or you do not accept rebooking.

• Your flight is significantly changed and you do not accept the changed itinerary or any alternative compensation.

How do you get a refund for a canceled flight?

The new DOT policy changed the way passengers get refunds. Previously, passengers were responsible for navigating airline policies to determine whether they were entitled to a refund and then explicitly request one. Under the new rules, airlines must automatically provide refunds without passengers having to explicitly request them.

What if the airline loses your luggage?

Airlines are required by law to compensate passengers if their bags are damaged, delayed or lost.

If your baggage is significantly delayed (that is, not delivered within 12 hours of a domestic flight arriving at the gate, or 30 hours for international flights) you are entitled to a refund for a checked bag fee, according to the DOT.

Read more from Yahoo News: Canceled flights? Lost luggage? These are your rights as an air traveler this holiday season.