The patience of thousands of airline travellers in the US is to be tested again by a winter storm stretching from Texas to southern New England.
Airlines cancelled more than 1,800 US flights scheduled for Thursday after scrubbing nearly 1,700 on Wednesday evening, according to tracking service FlightAware.com.
The airports likely to be hit hardest include Dallas-Fort Worth, Philadelphia, Reagan National and Dulles in the Washington area, as well as LaGuardia and Newark in New York City.
The bulk of cancellations are on regional carriers such as ExpressJet and Republic that operate flights with smaller aircraft for the major airlines.