As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 0456 - EN ROUTE IAH/DFW SHORTLY AFTER TAKEOFF, A STRONG ELECTRICAL BURNING SMELL WAS DETECTED IN THE COCKPIT AND CABIN. AIR INTERRUPTED AND RETURNED IAH WITHOUT INCIDENT. ACCOMPLISHED ENGINE RUN CHECKS FOR SYSTEM MALFUNCTION. NO ODOR OR SMOKE DETECTED. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)