American delivery firms UPS and FedEx have temporarily grounded part of their fleets of cargo planes after a mid-take-off crash in Kentucky on Tuesday left at least 14 people dead.
The UPS aircraft burst into flames shortly after take-off when it collided with neighbouring business premises, triggering a huge fire that gutted several buildings and closed Louisville International Airport.
UPS said the decision to ground MD-11 models followed instructions from manufacturer Boeing, while rival delivery giant FedEx confirmed it would follow suit.
Officials are yet to determine what caused the deadly crash.