The Federal Aviation Administration is moving to fire two controllers who left work about an hour before their shifts ended on March 22 -- the date of the deadly collision. The March collision left two pilots dead and at least six other people seriously injured Key points and original sources are listed below.

• The Federal Aviation Administration is moving to fire two controllers who left work about an hour before their shifts ended on March 22 -- the date of the deadly collision.S1

• The March collision left two pilots dead and at least six other people seriously injuredS2