FedEx and UPS on Friday announced a temporary ground stop for fleets of McDonnell Douglas, or MD-11, cargo planes following a deadly crash in Louisville, Ky., earlier this week that killed at least 12 people.

"MD-11s are approximately 9 percent of the UPS Airlines fleet," according to UPS in a short statement. "The grounding is effective immediately. We made this decision proactively at........

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