US Navy
Thailand's Chakri Naruebet aircraft carrier.
There are at least 42 commissioned aircraft carriers in service with at least 14 navies around the world.
Aircraft carriers come in many shapes and sizes: some carry large aircraft fleets of fighters and electronic attack planes, some only carry helicopters; some are nuclear powered, some are fueled by gas; some have vertical take-off and landing, some have short take-off and vertical landing, some have catapult assisted take-off and arrested recovery, where a tail hook snags a cable to catch the plane on landing.
Whatever the specifications, a carrier is not much use to any navy if it's breaking down or not able to launch the full range of combat sorties it was built to perform.
So we put together a list of seven of the worst commissioned flattops, which have a history of breaking down or limitations on the missions that these ships were built to perform.
Check them out below: