That comes after the TSA found four loaded guns in a one-week span earlier this month at the airport and had also found a set of Samurai swords and a 105 mm artillery shell casing with the primer intact.
One of the gun owners arrested earlier was Patrick Byrne, the CEO of Overstock.com. An Overstock.com spokesman said Byrne, who holds a permit to carry a concealed weapon, was in a rush to get to the airport, and mistakenly believed the weapon was at home instead of in a bag that he had not used in a while.
Last year, 20 guns were found at the airport so the TSA has found a quarter of that total in just the first 16 days of 2013.
In 2011, TSA found 26 firearms at the airport. Between 2002 and 2010, it averaged finding only nine guns a year there and never more than 19 in a year, according to data recently obtained through a Freedom of Information Act request. However, TSA did not track gun data in a three-year period during that stretch.
Firearms, ammunition, firearm parts and realistic replicas are always banned in carry-on luggage. However, they may be transported in checked baggage if the traveler declares them to the airline during the check-in process. Firearms must be unloaded and stored in a locked, hard-sided container.
Lists of items banned on flights are available online at TSA.gov, and through the "myTSA" mobile app.