St. Louis Downtown Airport

(via Flickr/dbking)

Will be updated. This is a developing story.

Updated 1:46 p.m.

Lambert Airport has tweeted that all passengers are off the plane:

Updated 1:33 p.m. 

The plane has emergency landed at Lambert Airport, apparently without incident. 

(via St. Louis Downtown Airport Facebook page)

Officials say the completion of improvements to the main runway at St. Louis Downtown Airport in Cahokia will help the facility expand its clientele and generate new business. 

The six-month, $7.4 million project widened and lengthened the runway and improved the runway’s lighting system. Airport director Bob McDaniel says they also strengthened the runway to support larger aircraft like the Boeing 757 and Airbus 320.