Commonwealth Consolidated Regulations Commonwealth Consolidated RegulationsA cabin crew member must be carried on a flight of an aeroplane if:
(a) the flight is a passenger transport operation; and
(b) either:
(i) the aeroplane has a maximum operational passenger seat configuration of more than 19; or
(ii) the aeroplane has a maximum operational passenger seat configuration of more than 9 and a maximum certificated passenger seating capacity of more than 19.