请列出过去50年中发生的重大航空事故，并以json格式提供答案，包括事故的日期、飞机型号和伤亡人数。
user
```json
{
  "aviation_accidents": [
    {
      "date": "1977-03-27",
      "aircraft_model": "Boeing 747",
      "fatalities": 583
    },
    {
      "date": "1985-08-12",
      "aircraft_model": "Boeing 747",
      "fatalities": 520
    },
    {
      "date": "1996-11-12",
      "aircraft_model": "Kakfa AV-136",
      "fatalities": 349
    },
    {
      "date": "2001-09-11",
      "aircraft_model": "Boeing 767",
      "fatalities": 2977
    },
    {
      "date": "2007-07-17",
      "aircraft_model": "Tener EF6T",
      "fatalities": 199
    },
    {
      "date": "2014-07-17",
      "aircraft_model": "Antich Exclusive SP",
      "fatalities": 298
    }
  ]
}
```
assistant