Winter Storm Titan has led to more than 4,500 being cancelled and thousands more delayed since Saturday.

With a strong winter storm beating down on the east coast, more than 2,250 flights were cancelled on Monday and close to 3,600 were delayed, as of 9 a.m. EST according to flight-tracking site FlightAware.com. A majority of the cancellations were announce preemtively and were cancelled on Sunday by airlines that didn't want to fly their crews into airports that were forecasted to have poor weather on Monday.

Monday's cancellations comes after 2,000 flights were cancelled on Sunday and 480 were cancelled on Saturday, bringing the total to more than 4,500 grounded flights since and it is expected to get worse, with more cancellations and delays expected to be announced throughout Monday.

Many big airlines offered passengers a waive on their flight change fees ahead of the storm and all passengers are advised to check ahead on their flight status before leaving for the airport.

The most impacted airport seems to be Washington's Reagan National Airport, with 283 cancelled departing flights and 240 cancelled arrival flights. The weather is expected to be the worst around the Washington, DC area, so many flights were cancelled on Sunday preemptively. The nation's capital is expected to get up to a foot of snow by the end of Monday.

Philadelphia International is also heavily impacted with cancellations and delays. New York airports like LaGuardia and JFK were also hit hard with disruptions.
The most affected airline is ExpressJet with 263 cancelled flights and 92 delays. US Airways wasn't far behind with 243 cancellations and 39 delays. American Eagle had 204 cancellations and 21 delays. Air Wisconsin, Southwest, JetBue and Republic were also deeply impacted by the weather.