Federal rules prohibit carrying fireworks in either carry on or checked baggage.
Many airlines have special rules for fireworks that may be even more restrictive than federal guidelines. Some airlines may ban fireworks outright. There's a reason for the rules to rain on your parade. The potential for spontaneous ignition combining with improper packing could result in a fire in an aircraft's cargo hold. Mislabeling denies airline emloyees information necessary to properly handle or store fireworks on the aircraft.