FAA says unintentionally deleted files are to blame for nationwide ground stop

A contractor working for the Federal Aviation Administration unintentionally deleted files related to a key pilot safety system, leading to a nationwide ground stop and thousands of delayed and canceled flights last week, the FAA said Thursday.

​A contractor working for the Federal Aviation Administration unintentionally deleted files related to a key pilot safety system, leading to a nationwide ground stop and thousands of delayed and canceled flights last week, the FAA said Thursday.