The rule bans the supersonic flight regardless of whether it's audible or not, so they'd still be asking for the rule to be changed.
They didn't ask for only a non audible change, because they know that it will not be. It's just marketing and misdirection because the truth is much less rosy.
They didn't ask for only a non audible change, because they know that it will not be. It's just marketing and misdirection because the truth is much less rosy.