@CNN: Airplane groundings like the one after the Boeing 737 Max 8 crashes are rare. Here are some of history’s biggest https://t.co/rpvcu0kFAe https://t.co/ls2r1J6ptz

@CNN: Airplane groundings like the one after the Boeing 737 Max 8 crashes are rare. Here are some of history’s biggest https://t.co/rpvcu0kFAe https://t.co/ls2r1J6ptz