The number of guns confiscated from passengers trying to board planes in the U.S. jumped 20 percent in 2013 to 1,828. Five guns were seized on the average day in U.S. airports.

Eighty-four percent of guns were loaded when Transportation Security Administration agents discovered them in security screenings. One in three of those guns had a bullet in the chamber.

The increase over 2012 is the third annual jump since 2010, and the largest.

Among the types of guns confiscated, two (.380 and 9mm) accounted for nearly half of all firearms the TSA found.