A co-pilot for Southwest Airlines was arrested this morning at Albany International Airport after Transportation Security Administration officers found a loaded handgun in his carry-on bag.

The co-pilot was scheduled for a flight to Chicago Midway International Airport, which was delayed for about four hours following the incident, according to a TSA statement.

TSA agents alerted the Albany County sheriff’s deputy assigned to the checkpoint after they detected the .380 caliber handgun, loaded with…