Flight canceled? Experts share advice about what you can do.

With a massive storm snarling travel across the U.S. and Canada this weekend, thousands of travelers have been stuck at airports — or waiting in long lines or on hold on the phone trying to rebook their flights.

More than 2,800 flights had already been canceled in the U.S. Tuesday as of 9 a.m. Eastern time, according to flight tracking service FlightAware. The pile-on of delays, which some travelers have called "hell," is likely to continue at least into Wednesday.