St. Louis air travelers will have one more thing to check on the way to the gate: their modesty.

The Transportation Security Administration will go live today at Lambert-St. Louis International Airport with the first of two full-body imaging machines that have been set up inside Terminal 2, which houses Southwest and other airlines. The machine will be used on the overflow west-end checkpoint near Starbucks.

The second should be ready at the busier main checkpoint next week. The TSA hopes to install more machines at other checkpoints in coming months.

Despite assurances that privacy will be guarded and that the images won't be revealing — or at least not too revealing — some passengers at Lambert on Thursday expressed doubts about the scanning devices.

"It doesn't feel right," said Brenda Chiarilli of western New York, who has gone through the imaging checkpoints at the Buffalo Niagara International Airport. "It feels violating..."