The U.S. Transportation Security Administration, which polices all airports nationwide, said three of the firearms were found at security checkpoints this week. The other gun was discovered last week, officials said. Additionally, screeners found two samurai swords and a military artillery shell in other luggage. In 2012, the TSA discovered 1,525 firearms at airports around the country and 20 at Salt Lake International Airport.
It is not illegal to carry firearms on an aircraft, as long as they are unloaded and stored in checked luggage. Attempting to pass through security with a firearm is illegal and could result in a fine of up to $7,500, the TSA said. Firearm parts, ammunition and even gun replicas are also prohibited in carry-on luggage.
The artillery shell discovered by screeners was a 105 mm casing with the primer still intact.
The TSA asks travelers to regularly be aware of what's inside their luggage, and whether it is permitted on the plane.
-Prohibited items (TSA)