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Wiktionary
kangaroo route

alt. (context travel English) An air route between the United Kingdom and Australia via Asia, especially that route flown by Qantas. n. (context travel English) An air route between the United Kingdom and Australia via Asia, especially that route flown by Qantas.

Wikipedia
Kangaroo Route

The Kangaroo Route traditionally refers to air routes flown by Qantas between Australia and the United Kingdom via the Eastern Hemisphere. The term is trademarked by Qantas, although it is used in the media and by airline competitors.

By 2003 over 20 airlines operated the route. Two airlines offer through flights (i.e. not requiring passengers to change plane en route) on the Kangaroo Route: British Airways and Qantas.