Nuclear-powered carriers USS Ronald Reagan, USS Nimitz and USS Theodore Roosevelt are taking part in the exercises, which will continue until Tuesday in the Sea of Japan, South Korea's Joint Chiefs of Staff (JCS) said.
"The objective of the drill in worldwide waters is to showcase the U.S. Navy's "unique capability to operate multiple carrier strike groups as a coordinate strike force effort", the service said in a statement".
The carriers are required to meet up in the Sea of Japan during the week off the Korean Peninsula, according to a United States defense official.
The four-day drill began Sunday, and it gives the three carrier strike groups an unusual opportunity to train together as an integrated unit alongside allied South Korean and Japanese forces. The exercise involves air defense drills, sea surveillance, replenishment at sea, defensive air combat training, and close-in coordinated maneuvers among others.
North Korean military personnel are reportedly preparing for their winter training exercises as three USA aircraft carriers lurk near the Korean Peninsula in an unprecedented show of force by Washington's navy.
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It marks the first time that three US aircraft carriers conduct joint exercises with South Korea's Navy.
Ships from Japan and South Korea joined the exercise, officials said.
"North Korean news outlets described the carriers" presence as a provocation, and officials in Pyongyang told CNN that they are concerned that Trump intends to start a conflict.
Bloomberg reported in October that the USS Nimitz and its strike group had roamed the Indian Ocean before moving into the Pacific after operating in the Middle East.
"It is a rare opportunity to train with two aircraft carriers together, and even rarer to be able to train with three", said U.S. Pacific Fleet Commander, Adm. Scott Swift. These exercises were conducted when strike force groups were sent to the seventh Fleet region of operations from the west coast of the USA are joined with the strike force group from Japan.