7 CFR 322.22 - General requirements.
(b) You may ship restricted organisms only aboard aircraft to the United States for transit to another country.
(c) You may transload a shipment of restricted organisms only once during the shipment's entire transit through the United States and only at an airport in the continental United States. You may not transload restricted organisms in Hawaii. In Hawaii, the restricted organisms must remain on, and depart for another destination aboard, the same aircraft on which the shipment arrived at the Hawaiian airport.