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CHARLOTTE, N.C. -- Several air carriers have extended flexible arrangements for passengers who may be affected by the severe winter weather across the Southeast this week.

According to Flight Aware, 151 flights out of Charlotte-Douglas have been canceled today-- that's second in the country for Tuesday, behind Dallas/Fort Worth. CLTis tied with DFWfor the number of Tuesday flight delays thus far with a total of 58.

In total, 1224 flights within, into or out of the United States have been canceled so far today, with another 2168 flights delayed.

Departure delays out of CLT are sitting at an average of 25 minutes.

Inbound flights are delayed at their origin for an average of 1 hour and 44 minutes due to snow and ice.

Charlotte Douglas officials tell NBCCharlotte they activated their snow plan on Monday evening, which includes pre-treating runways and taxiways. Deicing operations began at 9:30 Tuesday morning.

US Airwayssays they ve relaxed their ticket change policies for the cities affected by the winter storm. In most cases, the airline says travelers can change their trip online and change fees will be waived. If you re scheduled to travel February 11, 12 or 13, your travel date can be changed to any day between February 11 and 17.

Affected US Airways cities: Birmingham, AL ; Huntsville, AL ; Atlanta, GA ; Augusta, GA ; Salisbury, MD ; Asheville, NC ; Charlotte, NC ; Fayetteville, NC ; Greensboro, NC ; Greenville, NC ; Jacksonville, NC ; New Bern, NC ; Raleigh/Durham, NC ; Wilmington, NC ; Columbia, SC ; Florence, SC ; Greenville, SC ; Johnson City, TN ; Knoxville, TN ; Lynchburg, VA ; Newport News, VA ; Norfolk, VA

Many regional flights out of Charlotte-Douglas have been canceled today. For example, flights from CLTto Atlanta, New Bern, Richmond, Hilton Head, Charleston, Raleigh/Durham,Greensboro/High Point, Bristol, VA, and Birmingham have all been canceled.

Additionally, other destinations such as Minneapolis and New Orleans have seen flight cancelations out of Charlotte Douglas.

Southwest Airlines says travelers flying through Atlanta, Charlotte, Greenville-Spartanburg or Raleigh-Durham on Tuesday, February 11 or Wednesday, February 12, are eligible to reschedule their flights in accordance with Southwest's accommodation procedures, which allows them to change their travel dates and/or flight times at no additional charge.

For details, passengers can find additional information on Southwest.com, or by calling Southwest at 800-435-9792.

Delta Air Linessaid Monday night that more than 500 flights across their system had already been canceled for Tuesday due to the approaching storm.

The air carrier says passengers flying to, from or through Atlanta, Asheville, Charlotte, Greensboro, Greenville, Huntsville, Norfolk or Raleigh between February 11 and February 13 may make changes to their itinerary.

Tickets must be reissued on or before February 17, and travel must begin no later than February 17. For more information, passengers should visit Delta.com.

United Airlines says passengers flying through Asheville, Atlanta, Charlotte, Chattanooga, Columbia, Greensboro, Greenville/Spartanburg, Huntsville, Knoxville, Nashville, Norfolk and Raleigh/Durham may be able to modify their flights due to this week's winter weather. Original travel dates are between February 11 and February 12.

The carrier says fees for same-day flight changes are waived within 24 hours of the original departure time. For other changes, the change fee would be waived, but there may be a difference in fare pricing. For details, flyers should contact United.com.

American Airlines says they will offer passengers traveling through airports in the Southeast -- including Atlanta -- the capability to change their travel plans if their travel was scheduled between February 11 and February 13. Tickets must have been issued no later than February 10.

For details, passengers must contact American Airlines at 800-433-7300 or visit AA.com.

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