Letherboy is correct. Individual states do not have the ability to make laws the influence the operation of the airline industry for just this reason. Look at the recent attempt by New York to create a "passenger bill of rights" for flights operating out of New York airports. The law was struck down by the US District Court of Appeals.
While Ixtoc is correct that the dollar is legal tender, If a company or business is not in position to to handle cash transactions, they don't have to. If forced, carriers will just suspend this service and folks would be complaining about not being able to purchase anything on board the aircraft.
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