( CNN ) -- Check with your airline before you head to Hartsfield-Jackson Atlanta International Airport today . No , really . Airlines had canceled more than 3,200 flights within , into or out of the United States shortly before 10 p.m . ET , according to FlightAware.com . And many of those canceled flights involve the world 's busiest -- but not the snowiest -- airport . The last time the Atlanta airport used its four snow plows to actually plow snow was the great snow storm of January 2011 , said airport spokesman Reese McCranie . The airport also has six snow brooms , four de-icers , seven spreaders , 100,000 gallons of de-icing fluids , 50,000 pounds of de-icing solid material and 50,000 pounds of a salt/sand mix to clear roadways . Related : Deep freeze slams Deep South . As this latest winter storm crosses the country , flights at the Atlanta , Houston and Chicago airports have been the hardest hit by cancellations . Hartsfield-Jackson Atlanta is reporting 930 flights canceled , Houston 's Bush Intercontinental Airport is reporting 696 flights canceled and Chicago 's O'Hare International Airport is reporting 548 flights canceled . The numbers of arriving and departing flights canceled are expected to increase . `` Some planes are getting de-iced ... and we 're also putting preventative de-icing material on the ( five ) runways , '' said Houston 's Bush Intercontinental Airport spokeswoman Darian Ward . The airport has shut down an above-ground train that ferries passengers between terminals . Instead , passengers are being asked to ride buses . Airport operations may return to normal soon if it warms up today , Ward said . # ATL24 : A day in the life of the world 's busiest airport . Chicago 's O'Hare has been hit by airlines that are proactively canceling flights . O'Hare -- an airport with a bit of experience with snow removal -- reports only 15-minute delays for arrivals and departures . `` Our snow operations teams are out and doing their jobs , '' said Karen Pride , Chicago 's Department of Aviation spokeswoman . Cleveland weather is n't slowing down most flights , either . Thirty percent of Cleveland Hopkins International Airport 's Tuesday flights -- mostly smaller aircraft -- have been canceled . `` This is due to airline pull downs ( reductions because of bad weather in other locations ) and not because of weather , '' said airport spokeswoman Jacqueline Mayo . Call your airline to change your flight . Many airlines with flights departing and arriving at hardest-hit cities are offering flexible change policies for delayed customers . Check your airline website for more information . Delta Air Lines canceled more than 1,800 Delta and Delta Connection flights Tuesday , the vast majority at its Atlanta hub , said Delta spokesman Morgan Durrant . The nasty weather forced American Airlines to cancel about 350 flights Tuesday , mostly regional flights across the Gulf Coast , Mid-Atlantic and Midwest , an airline spokesman said . While declining to give specific numbers , United Airlines is `` reducing operations at Houston Intercontinental Airport and other airports in the mid-South and Southeast regions today due to severe weather , '' said spokesman Charles Hobart , Tuesday . Citing near-record lows in the Midwest , United is also reducing operations Tuesday at their Chicago and Cleveland hubs and other Midwest airports . Make sure to confirm flights Wednesday . Depending on how-hard hit they are , Houston and Atlanta airports may still be recovering from storm conditions on Wednesday , said David Baker , FlightAware 's chief executive officer . The Chicago and Cleveland airports could also face delays , depending on weather conditions in those Midwest cities . And what about your Amazon delivery ? Severe winter may also affect the delivery of your packages . Remember how winter storms slowed pre-Christmas deliveries ? FedEx , which is posting service alerts on its website , has already warned customers that hazardous conditions in Louisiana , Mississippi and Texas may cause delays in Illinois , Indiana , Kentucky and 12 other states . UPS is reporting `` severe weather impacts '' in some of its delivery areas , according to company spokeswoman Susan Rosenberg . Check UPS.com to see which zip codes are affected . `` We make every effort to maintain service as long as safety permits , '' she wrote , via email . `` If deliveries are interrupted , we will resume service as soon as it is safe to do so . ''
As latest storm moves across the country , airlines cancel flights . Atlanta airport , the busiest in the world , prepares for first snow plowing since 2011 . Chicago and Cleveland airports deal with snow as a common occurrence .