In this Act, unless the contrary intention appears:
"aircraft" has the same meaning as in the Civil Aviation Act 1988 , but does not include model aircraft.
"Australian territory" has the same meaning as in the Air Navigation Act 1920 .
"Commonwealth aircraft" means an aircraft, other than a Defence Force aircraft, that is:
(a) in the possession or under the control of the Commonwealth or an authority of the Commonwealth; or
(b) being used wholly or principally for a purpose of the Commonwealth.
"Defence Force aircraft" means aircraft of any part of the Defence Force, including any aircraft commanded by a member of that Force in the course of duties as such a member.
"in flight" has the meaning given by section 5.
"operator" has the meaning given by section 6.