The number of guns found in carry-on bags at O'Hare International Airport declined, falling from 20 in 2014 to 16 last year.
Meanwhile, Chicago's Midway International Airport rose from six in 2014 to 16 last year.
The Transportation Security Administration released figures yesterday.
Nationwide, firearm discoveries at airport security checkpoints rose nearly 20 percent in 2015 to hit a record 2,653. Nearly 83 percent of them were loaded.
Dallas/Fort Worth International Airport saw the biggest number. Screeners there intercepted 153 guns last year.
Firearms and ammunition are prohibited in carry-ons.
They can be transported in checked baggage if they are unloaded, properly packed and declared to the airline.