UPDATE: Ground stop lifted for all American flights

A rare ground stop of U.S.-based aircraft has been lifted.The Federal Aviation Administration (FAA) ordered a nationwide ground stop on all American flights on Friday afternoon. It was lifted shortly after 8:30 p.m. on Friday.The problem has been blamed on what was called a "temporary telecommunications outage".The FAA said in a social media post that the ground stop, only the third in the States since 9/11, was "out of an abundance of caution".The outage affected major air route traffic control