The Union Jack is a prominent flag that represents the United Kingdom. However, it is not exclusively flown by UK ships. Various countries' ships also fly under the Union Jack for historical or administrative reasons.

One of the countries whose ships fly under the Union Jack is Australia. Australia was once a British colony, and even after gaining independence, it maintained close ties with the UK. The Australian flag, known as the Australian Red Ensign, features the Union Jack in the canton. This means that Australian ships, including naval vessels, often display the Union Jack as a symbol of their historical connection.

New Zealand is another country whose ships fly under the Union Jack. Similar to Australia, New Zealand was once a British colony and still maintains strong ties with the UK. The New Zealand flag, known as the New Zealand Ensign, also incorporates the Union Jack in the canton. Therefore, ships from New Zealand often display the Union Jack alongside their national flag.

Canada, another former British colony, also features the Union Jack on its flag. The Canadian Red Ensign, used from the late 19th century until 1965, prominently displayed the Union Jack in the canton. Although the current Canadian flag, adopted in 1965, no longer features the Union Jack, it is still seen on some governmental and military vessels as a symbol of Canada's historical ties with the UK.

In addition to these countries, various other British Overseas Territories and Crown Dependencies also fly under the Union Jack. These include territories like Bermuda, Gibraltar, the Falkland Islands, and the Isle of Man. As part of the British realm, these regions display the Union Jack as a symbol of their association with the United Kingdom.

In conclusion, several countries' ships fly under the Union Jack, including Australia, New Zealand, Canada, and various British Overseas Territories and Crown Dependencies. These nations and regions display the flag as a symbol of their historical or administrative connection to the United Kingdom.

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