noun
flag-of-convenience ship
A ship registered in a country with favorable regulations, often for tax or labor cost advantages, while the beneficial owner is based elsewhere.
便宜置籍船は、船主の国籍とは異なる国に登録されている。
A flag-of-convenience ship is registered in a country different from the shipowner's nationality.
Compound of 便宜 (convenience) + 置籍 (registration) + 船 (ship). The term is a direct translation of the English 'flag of convenience ship'.