Oh, shucks...
EFFECTIVE IMMEDIATELY, Bear Spray is no longer permitted on PenAir passenger aircraft, but must be shipped as Cargo. According to the FAA, sprays containing more than 2% by mass of Tear Gas (CS or CN) are prohibited in checked baggage. Bear Spray rarely contains 2% or less by mass of Tear Gas. One 4 ounce (118ml) container of Self Defense Spray, however, is permitted in checked baggage provided it is equipped with a safety mechanism to prevent accidental discharge and contains 2% or less by mass of Tear Gas.