As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 424 - DURING POST FLIGHT WALKAROUND INSPECTION, 2 AFT COWLING PANELS WERE NOTED MISSING ON NR 2 ENGINE. REPLACED MISSING COWLING PANELS. SECURED LATCHES. NO OTHER DEFECTS NOTED. A/C OK FOR SERVICE. COWL PANELS DEPARTED A/C DURING T/O ROLL AT MDW. MISSING COWL PANELS WERE LOCATED ON RUNWAY AT MDW. (M)