No amendment is needed to create an FAA. Its covered well in the interstate commerce clause as a federal power. And this is not the tortured 1930s version.
Regarding the Commerce Clause (1.8.3), regardless what FDR’s state sovereignty-ignoring activist justices wanted everybody to think about those powers, note that a previous generation of state sovereignty-respecting justices had clarified that the states have never expressly constitutionally delegated to the feds the specific power to regulate INTRAatate commerce.
”State inspection laws, health laws, and laws for regulating the internal commerce of a State, and those which respect turnpike roads, ferries, &c. are not within the power granted to Congress [emphases added].” —Gibbons v. Ogden, 1824.
But since patriots have not heeded the warnings of Madison and Jefferson, patriots asleep at the wheel for several generations with respect to the corrupt feds unconstitutionally expanding its powers, particularly where unconstitutional federal interference in INTRAstate commerce is concerned, patriots actually have a big mess to clean up concerning unconstitutionally big federal government imo.
Patriots would probably find many federal commerce laws that are based on the politically correct interpretation of that clause by FDR’s activist justices. Such laws should either be removed from the books, or the states possibly appropriately amending the Constitution after the fact.