Taking an entire type of plane out of *service* is a big deal. And it's usually prompted by a deadly crash. Here's a list of some of the biggest groundings in US ...
https://ift.tt/2UBduTP https://ift.tt/2SeTG7dAirplane groundings are rare. Here are some of history's biggest - CNN
Airplane groundings are rare. Here are some of history's biggest CNN
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