St. Louis Lambert International Airport (STL) officials are urging passengers to arrive two hours before their scheduled boarding time on Wednesday.

File photo courtesy of St. Louis Lambert International Airport

Thanksgiving Eve is traditionally one of the busiest travel days of the year.

Lambert officials are expecting 21,000 check-ins on Wednesday, and anticipate another 23,000 passengers to check-in for departures on Sunday.

Lambert officials predict it will be one of the busiest Thanksgiving holiday travel periods at STL in years.

Airport officials also say terminals and gates will be even more crowded Wednesday with passengers connecting through St. Louis.

Connecting passenger traffic at STL, which accounts for those passengers who’ve already cleared security at their originating airports, is up 30 percent in 2017.