(CNN) This past week reminded the world that grounding an entire type of airliner because of safety concerns is a big deal -- and it happens very rarely.

In this case, two deadly crashes of Boeing 737 Max 8s within five months raised enough concern by aviation regulators worldwide to ground the plane until investigators can figure out if the crashes are directly linked.

It won't be possible to establish a definitive link until the investigation of the March 10 crash of Ethiopian Airlines Flight 302 in Addis Ababa is complete. Information from the flight data recorder and cockpit voice recorder is now in Paris for analysis.

When regulators take an entire type of plane out of service, it can have a huge economic impact on the maker of the aircraft and on airlines that that fly it.

Here's a brief list of major airplane groundings over the past eight decades.

An All Nippon Airways Boeing 787 Dreamliner

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