Guerreo had an unloaded .40 caliber semi-automatic handgun in his possession at John F. Kennedy International Airport Thursday and was arrested after he attempted to declare the weapon at the Delta Airlines counter.
Guerreo was scheduled to board Delta Flight 1429 to Las Vegas, departing the airport at 8:10 a.m.
He was in New York City to promote his May 4 fight with Floyd Mayweather at the MGM Grand in Las Vegas.
(ABC News Radio contributed to this report.)
