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Publication 52 - Hazardous, Restricted, and Perishable Mail >
7 Air Transportation Requirements > 73 Restricted Matter: Air Transportation > 731 Refusal by Air Carrier
Certain restricted articles, as described in 49 CFR 100-185 and the operator variations of the air carriers, may be accepted for air transportation if properly packaged. These articles must be labeled and bear a shipper\u0027s declaration in triplicate, as required by 49 CFR 172.204, or must be marked according to the air carrier\u0027s operator variations. Refer to the technical instruction of the International Civil Aviation Organization (ICAO) for air carrier operator variations.
Mailpieces refused by an air carrier that contain restricted matter, or are suspected to contain hazardous matter, must be handled in accordance with 711.