Another Monday, another snowy mess.

U.S. air travel was snarled at the beginning of the week for the third Monday in a row as a winter storm blanketing the northeastern United States resulted in the cancellation of more than 1,800 flights Monday and heavy delays at several major East Coast hubs.

Meanwhile, airports in the Pacific Northwest faced severe weather as well, including rain and heavy winds. Monday’s disruptions followed the cancellation of more than 700 flights on Sunday, according to FlightAware.

Boston’s Logan International Airport was hit particularly hard, with the majority of flights grounded as the city digs out from record-breaking snowfall. Boston has had more than 40 inches of snow, setting the record for the snowiest seven-day period, according to the National Weather Service.

Scrubbed flights are also mounting at New York-area airports, with LaGuardia Airport facing the most cancelled flights on Monday and flight delays averaging seven hours. Both John F. Kennedy International Airport and Newark’s Liberty International Airport were also experiencing severe delays and cancellations.

Once again, major airlines issued waivers on change fees for travelers passing through the affected airports. American Airlines, for example, is allowing customers scheduled to travel between Sunday and Tuesday the ability to reschedule their flights by Friday without a fee.