AHM monitors aircraft systems in real-time to detect developing issues before they become failures. FedEx has integrated AHM across various aircraft types in its fleet, including the Boeing 777, 767, 757, and MD-11, leveraging the system's ability to handle many reportable faults.

UPS and FedEx's fleets of MD-11 planes are grounded, which can each carry thousands of packages. Logistics experts say some cargo could shift to passenger planes, trains and trucks.

Thanksgiving Day is on November 27. Wondering what will be open and closed? Or if your mail will come and garbage picked up? Here's what to know.

After a UPS plane crash, the FAA ordered all MD-11 aircraft to stay grounded as part of an investigation into their safety.