UPS Airlines has grounded an entire fleet of its cargo jets indefinitely, warning of months-long disruption during peak holiday season.The airline does not expect its fleet of McDonnell Douglas MD-11s, which was the type of plane involved in a deadly crash in Louisville, Kentucky, on Nov. 4 to return to service for several months, according to the Associated Press.The UPS cargo plane's engine fell off and burst into flames shortly after takeoff from Louisville Muhammad Ali International Airport. The Honolulu-bound flight crashed at around 5:15 p.m., hitting a nearby industrial area and killing...

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