In Canada, In Huxley v$.$ Aquila Air $($Chapter $9,$ Appendix C$),$ it was held that:

options:

In order for an air way bill to be considered as part of an international carriage, the tickets must be separately booked by the same agent

In order for an air way bill to be considered as part of an international carriage, the tickets must be booked as part of one continuous flight.