The Federal Aviation Administration on Monday said it has rejected a proposal to halve the number of hours required to become a co-pilot, as a severe shortage of aviators prompts carriers to cut routes.
Normally, 1,500 hours of flight time are required before a new pilot can fly commercially, though there is an exception for certain military experience that cuts the requirement in half.
The so-called 1,500-hour rule was passed after the fatal Colgan Air crash in February 2009 near Buffalo, New York.
The crash also led to new requirements for a minimum period of rest for pilots before a flight.
The FAA's decision comes as airlines grapple with a severe shortfall of pilots, which executives have blamed on service cuts, particularly to small cities.