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Story summary
- The families of two victims sue United Parcel Service (UPS) and other companies for negligence after the November 4 crash that killed 14 and injured 23.
- They allege the 34-year-old aircraft was not airworthy due to inadequate maintenance.
- The National Transportation Safety Board found fatigue in the plane's hardware.
- Attorneys are conducting their own investigation alongside the NTSB.
- UPS has grounded all MD-11s to address needed repairs.
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