Only certified persons/businesses are allowed to install airbags and do the mandatory function testing required after installation.I've done some asking around and as far as I can tell it is not illegal in Texas for a car owner to DIY his own airbag repair.
Additionally, although it is no longer relevant now since I wound up not needing shipping, and in case anyone missed it from post #15, here below is a link about how to ship airbags:
The United States Postal Service (USPS) and other shipping services have special regulations for the transportation of hazardous materials. While this includes obvious hazards such as acid, weaponry and explosives, these guidelines also regulate the shipment of airbags. Airbags are considered to...itstillruns.com
Unauthorized persons (persons without certified training) who do so are guilty of airbag fraud and subject to both criminal and civil penalties.
Tex. Transportation Code §547.614. RESTRICTIONS ON AIRBAGS.
(a) A person commits an offense if the person knowingly:
(1) installs or purports to install an airbag in a vehicle; and
(2) does not install an airbag that meets all applicable federal safety regulations for an
airbag installed in a vehicle of that make, model, and year.
(b) An offense under this section is a Class A misdemeanor.
Also, a vehicle must not be certified as inspected with an active airbag warning code or light on.