10 CFR §150.21
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as specifically approved by the Commission no shipment of special nuclear material in excess of 20 grams or 20 curies whichever is less of plutonium or uranium-233 shall be made by a licensee of an Agreement State in passenger aircraft.