Catching a flight on Sunday? Get ready for major travel trouble if your flight is in the path of Winter Storm Diego.

American Airlines said it has proactively canceled 1,100 Sunday flights due to the storm. That is on top of 225 cancellations on Saturday.

The cancellations are now expected to spill into Monday, with American saying late Saturday that 300 Monday flights have been canceled.

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The bulk of the canceled flights are to and from Charlotte, North Carolina, where American has a major hub. The airline said it is reducing operations at Charlotte Douglas International Airport beginning Saturday night.

All flights to and from Charlotte on American's regional partners are canceled for Sunday and more than two out of three of its other Charlotte flights are canceled.

Since Charlotte is a major connecting hub for American, the cancellations also impact passengers headed to and from destinations not affected by the storms.

Southwest Airlines has canceled four flights to and from Charlotte on Sunday in addition to canceling the last four flights due to arrive at the airport on Saturday.

Travelers are advised to check their flight status before they head to the airport.

American, Southwest and other airlines have had travel waivers in place this week, allowing passengers scheduled to fly to, from or through Charlotte and other cities to change their plans without penalty to get out of the storm's path.

Travelers who didn't change their flights are eligible for a refund if there flight is canceled, even if they have a nonrefundable ticket.