What was found
ORD - FLT 386 - EN ROUTE ORD-LGA, A THICK HAZE/SMOKE IN CABIN AND COCKPIT WAS NOTED. PASSENGERS COMPLAINED ABOUT BEING ILL FROM SMOKE, RAN CHECKLIST. RETURNED ORD AND LANDED WITHOUT INCIDENT. ACCOMPLISHED PACK BURN OUT, TEST NORMAL DURING CHECK. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)