Under DOT regulations , airlines must pay the full cost of air travel to consumers . Airlines violated price advertising rules twice in five months . The new penalty means United also will have to pay the balance on a fine for a violation over the summer . Corporate taxes and fees per passenger are the only exception to the rules .
Under DOT regulations , airlines must pay the full cost of air travel to consumers . Airlines violated price advertising rules twice in five months . Corporate taxes and fees per passenger are the only exception to the rules .