Delta B763 near Atlanta on Mar 10th 2014, pressurization problems

A Delta Airlines Boeing 767-300, registration N129DL performing flight DL-15 from Atlanta,GA to Salt Lake City,UT (USA), was enroute at FL320 about 170nm westnorthwest of Atlanta when the crew descended the aircraft to FL230 and returned to Atlanta for a safe landing about 70 minutes after departure.

A replacement Boeing 767-300 registration N126DL reached Salt Lake City with a delay of 3:15 hours.

A passenger reported the air conditioning did not work. About one hour into the flight the captain announced that they were having pressurization issues, could not overfly the Rocky Mountains and needed to return to Atlanta.