ATLANTA — Rock guitarist Rick Derringer has pleaded guilty and agreed to pay a $1,000 fine after stepping off a Delta Air Lines flight from Mexico with a loaded handgun in Atlanta’s airport.

Prosecutors say Derringer told a federal air marshal he kept his gun with him on commercial airline flights 30 to 50 times a year.

His plea this week involved only one charge: Carrying a weapon aboard an airplane and in a secure area of Atlanta’s airport Jan. 9.

Derringer told the air marshal that carrying his gun on planes has never been a problem until it was found in his carry-on after arriving from Cancun.