The US Federal Aviation Administration (FAA) has sent a team of experts to review safety procedures at the Washington air traffic control centre as part of its effort to ensure safe air travel.
The move was taken after air traffic controllers (ATC) at the Warrenton centre recorded its 22nd mistake, according to The Washington Post.
During the incidents, the ATC's did not meet the FAA regulations, which require planes to be separated by at least three miles or 1,000 feet in altitude.
The FAA has attributed the national increase in the number of errors by controllers to a new approach that encourages controllers to disclose their own mistakes.
The FAA will hold a meeting on 17 August with top management and safety experts in Washington to discuss urgent safety problems in relation to aviation.