???????????1????????????????29?????????,?????????????????,???(American Airlines)????AA5342???????????????????,??????Bombardier CRJ700??,?60?????
?????????????“???”?
?????????,???????????????????????,????
29??,????????(DCFD)???????,??????????????????????,???????
?????????????,?PSA???????,???????????????H-60(??????????????“??????????”?)???(???????????? ???) ??????????????:????
?????:???????????
????????????????????
???“??”???????:??????
?????????“??”??????????
NHL???????????????????
????:????????????????
????!?????????????
????2016???48.6???????4.3%
?????11???????????
????:????????????????
??????????????????
??????????????500????80%?
?????????:????????????
«?????»??????????????
????????????????????
?????????“??”??????????
?????????????????????
??19????????????????????
????:????????????????1.10
??????????????????????
????“?”????????:??????
???????????????????????
??????560?????????2000??
??????15??????????8???
??:????4?????????????