The full-body, X-ray scanners will be removed from New York's Kennedy, LaGuardia and other major airports, the Associated Press reported. TSA said the decision was made to speed up security at busy airports.

TSA spokesperson Sterling Payne said in an email to CNBC.com that, "As part of an effort to maximize the efficiency and deployment of Advanced Imaging Technology (AIT), TSA is strategically moving smaller, faster AIT units to busier airports and moving the larger units to airports with less passenger volume."

"This move will add additional units outfitted with automated target recognition (ATR) software, which enhances privacy even more by providing a generic body outline, and eliminates the need for a separate officer in another to room to participate in screening," Payne says.

The less invasive "Gumby" scanners with the ATR software will be in use at the following airports, the TSA confirms to CNBC.com:

Boston Logan International Airport

Chicago O'Hare International Airport

Los Angeles International Airport

New York's John F. Kennedy International Airport

New York's LaGuardia Airport

Orlando International Airport

Charlotte Douglas International Airport

Based on frequent flier reports on Flyertalk.com, the more invasive X-ray machines are still in use at some of the busiest U.S. airports, including:

Phoenix Sky Harbor International Airport

Seattle-Tacoma International Airport

Lambert-St. Louis International Airport

The Associated Press contributed to this report.

(CORRECTION: The X-ray machines are not in use at Dallas-Fort Worth, Denver, Hartsfield-Jackson Atlanta, Las Vegas and San Francisco airports. A previous version of this story incorrectly stated they did.)