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Kate's toy airplane
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5025 is a postal code in Australia

The number on Kate's toy airplane (5025) is the postal code of Flinders Park in South Australia.

Flinders Park is named after Matthew Flinders, an English explorer, navigator, and cartographer who lived from 1774 to 1814. Matthew Flinders is the reason Australia is named Australia. He suggested the name Australia in a book that he wrote while circumnavigating and creating the very first full map of the new continent.

This postal code and its reference to Matthew Flinders, who discovered and named the continent Australia, is one puzzle piece that fits snugly next to Hurley's statement "Australia is the key to the whole game" from the episode "The Shape of Things to Come".

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