Paragraph 1
Each Contracting State shall take such measures as may be necessary to establish its jurisdiction over the offences in the following cases:
(a)
when the offence is committed in the territory of that State;
(b)
when the offence is committed against or on board an aircraft registered in that State;
(c)
when the aircraft on board which the offence is committed lands in its territory with the alleged offender still on board;
(d)
when the offence is committed against or on board an aircraft leased without crew to a lessee who has his principal place of business or, if the lessee has no such place of business, his permanent residence, in that State.