What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Just after departure from cmi American eagle flight #4278, bound for ord, the flight attendant noticed misty smoke being emitted from the air vents. The flight attendant informed the cockpit crew who received a warning about the same time from eicas for lavatory smoke. The cockpit crew declared an emergency with cmi ATC and returned to cmi landing without incident. The aircraft was taxied to the gate and deplaned normally.
As the FAA filed it
(-23) JUST AFTER DEPARTURE FROM CMI AMERICAN EAGLE FLIGHT #4278, BOUND FOR ORD, THE FLIGHT ATTENDANT NOTICED MISTY SMOKE BEING EMITTED FROM THE AIR VENTS. THE FLIGHT ATTENDANT INFORMED THE COCKPIT CREW WHO RECEIVED A WARNING ABOUT THE SAME TIME FROM EICAS FOR LAVATORY SMOKE. THE COCKPIT CREW DECLARED AN EMERGENCY WITH CMI ATC AND RETURNED TO CMI LANDING WITHOUT INCIDENT. THE AIRCRAFT WAS TAXIED TO THE GATE AND DEPLANED NORMALLY.