The UPS cargo plane that crashed Nov. 4 in Louisville appears to have undergone heavy maintenance during a six-week period in September and October, based on flight records and remarks from the National Transportation Safety Board .

The plane stopped in San Antonio from Sept. 3 to Oct. 18, where ST Engineering operates a facility providing "exclusive heavy maintenance" to UPS MD-11 planes like the one involved in the recent crash, according to the firm .

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