OneOfMany: A franchise issued by government agency/public entity cannot provision terms that violate the First Amendment (or any part of the Constitution for that matter — which takes precedence over Federal, State and local laws and regulations), whereas a private entity can in many instances.
And legally you need not demonstrate that something is an “established tenet of Judaism”. You need only demonstrate you in good faith believe your religion asks that of you. And a private bus company is legally entitled to have separate seating.