CHICAGO -- For the second time this week, a Southwest Airlines flight is having problems at Midway Airport.
Flight No. 4384 to Philadelphia was ready for takeoff just before 6 a.m. Friday. That's when a pilot saw signs of a mechanical issue.
The plane went back to the gate on its own, and the passengers got out. They're being put on another plane.
Southwest says they found no indications of a problem, but the plane remains in maintenance.
This comes after a Southwest Flight aborted takeoff when the engine caught fire on the runway Wednesday night.