UPS和联邦快递的MD-11地面货运机队正在接受调查，肯塔基州致命坠机事故的调查仍在进行中。 在路易斯维尔发生一起造成至少14人死亡（包括3名机组人员）的UPS飞机坠毁事故后，UPS和联邦快递已停飞所有MD-11货机。这是UPS历史上最严重的空难。波音公司建议停飞该机型，并正与美国联邦航空管理局（FAA）进行进一步分析。此举影响了UPS 9%的机队和联邦快递4%的机队。这起11月4日的坠机事故发生在起飞后不久，美国国家运输安全委员会（NTSB）仍在对满是残骸的现场进行调查。 UPS, FedEx ground MD-11 cargo fleets as investigation continues into deadly Kentucky crash UPS and FedEx have grounded all MD-11 cargo planes after a fatal UPS crash in Louisville killed at least 14 people, including three crew members — the deadliest in UPS history. Boeing recommended the grounding while it conducts further analysis with the FAA. The move affects 9% of UPS’s and 4% of FedEx’s fleets. The Nov. 4 crash occurred shortly after takeoff, and the NTSB continues to investigate the debris-filled site.