@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/Bj56CApHao https://t.co/jHYpdY5Bwj

@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/Bj56CApHao https://t.co/jHYpdY5Bwj