The MD-11 cargo jet flown by UPS that crashed Tuesday had been sidelined for six weeks before the deadly incident, according to federal investigators.

The jetliner was undergoing major maintenance at an aviation service center in San Antonio, Texas.

But as authorities try to figure out what happened before the Louisville crash, Chicago ties to the investigation have come to light.

One of the plane's final flights before being put up for maintenance was a Chicago O’Hare to Louisville flight. And that isn't the only Chicago tie to the investigation.

The Hawaii-bound UPS jet only reached 475 feet and 210 miles per hour before crashing after the 34-year-old plane’s left engine broke off, later to be found on the airfield.

Now, federal investigators are keying on that engine: a General Ele

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