Southwest Airlines flight 663 on its way from Orlando, Florida, to Milwaukee, Wisconsin, made a priority landing at about 10:18 a.m. on August 17.
The pilot declared emergency just before landing at Milwaukee, after the crew reported an electrical smell onboard.
The plane carrying 127 passengers and 5 crew members landed uneventfully and no one was hurt.
The aircraft was taken for examination while an alternate plane was arranged for continuing the next flight to Los Angeles.

Cargolux Airlines flight CV-856 had to divert for an emergency landing in Vienna, Austria, on January 11th.
British Airways flight BA-294 had to return and make an emergency landing in Chicago, Illinois, on September 12th.
Cathay Pacific flight CX-9993 had to return and make an emergency landing in Hong Kong, China, on March 6th.
Air Canada flight AC-877 had to return and make an emergency landing in Frankfurt, Germany, on May 15th.