There are at least 42 commissioned aircraft carriers in service with at least 14 navies around the world.
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These are the world's 7 worst aircraft carriers that are currently in service
These commissioned aircraft carriers were built for combat, but have a history of breaking down or repeated problems with conducting the full range of missions that they were built to perform.
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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.
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Check them out below:
China's Liaoning (16).
Commissioned in 2012, the Liaoning is a Kiev-class aircraft carrier that Beijing tricked Ukraine into selling by sending a Hong Kong businessman to purchase it under the guise of it being used as a casino in 1998.
The Liaoning was later commissioned in 2012, becoming China's first aircraft carrier.
But just a few years later, the Liaoning was spewing steam and losing power, and in at least one incident, a steam explosion blew out the ship's electrical power system.
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Since then, the Liaoning has been rather unreliable, like most Soviet Kiev-class carriers, and used mostly as a training carrier.
Russia's Admiral Kuznetsov (063).
The Kuznetsov is a Kiev-class carrier that is currently undergoing repairs and won't be ready for service until 2021.
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Commissioned in 1995, the Kuznetsov experienced a serious breakdown in 1996, and wasn't available again until 1998.
The National Interest recently even placed the Kuznetsov on its list of 5 worst aircraft carriers ever built.
Take a tour of the Kuznetsov here.
Thailand's Chakri Naruebet (911).
Commissioned in 1997, the Chakri Naruebet was once a fleet carrier, but was later relegated to a helicopter carrier in 2006, mostly because of budgetary issues.
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Although the Chakri Naruebet was used after the 2004 Indian Ocean tsnuami and in rescue operations after flooding in Thailand in 2010 and 2011, the carrier has mostly resided in port for much of its 20-year career with the Thai Navy.
So while the Chakri Naruebet has not necessarily suffered from design flaws or repeated maintenance issues, we included it on the list because it's simply not being used for what it was supposed to.
Read more about the Chakri Naruebet here.
America's USS Wasp (LHD-1).
The Wasp is an amphibious assault ship that was recently fitted to carry F-35Bs.
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But until then, the Wasp was
Australia's HMAS Canberra (L02).
Commissioned in 2014, the HMAS Canberra is a Landing Helicopter Dock carrier, and one of two for the Royal Australian Navy.
Although the Canberra took part in RIMPAC 2018, it was sent back to port in March 2017 with serious propulsion problems.
It was expected to take only about seven to 10 days to resolve, but in May 2017, the Canberra was still undergoing repairs in dry dock.
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HMAS Adelaide (L01).
Commissioned in 2015, the HMAS Adelaide is Australia's other Landing Helicopter Dock carrier.
The Adelaide also took part in RIMPAC 2018, but it was sent back to port at the same time in 2017 as the Canberra with the same problems.
Given that both ships, which were commissioned around the same time, had similar problems at the same time, might very well hint at design problems.
America's USS Gerald R. Ford (CVN-78).
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Che USS Gerald R. Ford is the most powerful and capable supercarrier ever built — but it's been dogged by repeated problems and is still not ready for combat a year after it entered service.
In April 2017 and January 2018, the Ford was sent back to port after experiencing a
In May 2018, the Ford was at sea undergoing trials, when its propulsion system malfunctioned, forcing back to port again after only three days.
The Ford has also had issues with the state-of-the-art
"It's important to give new complex warships and weapon systems time to mature through operational experience," Wertheim told Business Insider in an email. "If you had looked at many of the most successful weapons and warship designs, they often might have looked like miserable failures early in their life cycle, but they eventually turned a corner."
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You can take a tour of the Ford here.
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