What are passengers entitled to if an airline cancels or delays your flight?

More airport chaos could be on the way as the summer travel season continues. It follows major cancellations and delays over Memorial Day weekend and the Fourth of July weekend. Over the July 4 weekend, airlines canceled more than 2,200 U.S. flights and another 25,000 were delayed. Many of the hiccups were blamed on weather and staffing shortages, so that begs the question, how are the airlines making good with passengers?