General requirements
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) You may transit restricted organisms from any region through the United States to another region only in accordance with this part. For a list of restricted organisms, see § 322.13(a).
(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.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.