若FAA强制执行NTSB因美国西南航空公司1380航班引擎故障所提出的建议,各航空公司将不得不对数千架在役的波音737NG窄体机进行改进,重新设计发动机整流罩。Airlines would have to retrofit thousands of in-service Boeing 737NG narrowbodies with redesigned engine cowls if the FAA enforces an NTSB recommendation stemming from an engine failure on Southwest Airlines Flight 1380 in April 2018.