From left to right, Shaun Jones and Jacob Caldwell of BAM Contracting in St. Louis, work to repair damage to windows in the main terminal of St. Louis' Lambert International Airport, Saturday, April 23. The airport remains closed as of Saturday afternoon due to damage caused by Friday evening's storm.

A storm-damaged sign hangs upside down at Lambert-St. Louis International Airport April 23 in St. Louis, Missouri. The airport is closed today after tornadoes hit St. Louis last night, causing extensive damage.

Workers view damage to the roof of the main concourse at St. Louis Lambert International Airport caused by a strong Good Friday storm that passed through the area April 23. The airport remains closed after the roofs of homes were blown off, trees smashed into houses, semitrailers blown off highways and numerous windows shattered.