The Kansas City Aviation Department is anticipating one of its biggest travel days this year to bring in thousands Sunday.

During the 2015/16 winter holiday KCI anticipated to will serve more than 509,000 passengers on 4,780 arrivals and departures. Sunday is one of the peak days that will see approximately 37,000 travelers in and out of KCI.

Consistent with historical patterns, the lightest travel days were expected to be Christmas Eve, Christmas Day, New Year’s Eve and New Year’s Day. The total number of revenue passengers boarding aircraft in scheduled service volumes are expected to range from 1.9 million to 2.4 million during the 17-day period, with the busiest days seeing more than 10 percent more passengers than the average day in 2015.

The other busiest travel days were Sunday, January 3; Friday, December 18, and Wednesday, December 23, respectively.

Airlines for America (A4A), the industry trade organization for the leading U.S. airlines, projects that 38.1 million passengers will fly on U.S. airlines during the 17-day period from Friday, December 18 through Sunday, January 3. That is an increase of more than three percent or approximately 73,000 more travelers nationwide each of those days from the comparable period a year ago. Last year, 36.9 million customers were estimated to have traveled by air. A4A projects that 12 percent of those traveling will be on international flights.