Nothing in the Convention or in this Part shall be deemed to exclude any liability of a carrier:
(a) to indemnify an employer of a passenger or any other person in respect of any liability of, or payments made by, that employer or other person under a law of the Commonwealth or of a State or Territory providing for compensation, however described, in the nature of workers' compensation; or
(b) to pay contribution to a tort - feasor who is liable in respect of the death of, or injury to, the passenger;
but this section does not operate so as to increase the limit of liability of a carrier in respect of a passenger beyond the amount fixed by or in accordance with the Convention.