Although four-engine operation would be more efficient, upgrading the airframe to run with only four engines would necessitate further alterations to the aircraft's systems and control surfaces especially the rudder, extending the project's duration, cost, and complexity.

尽管四引擎运行效率更高，但将机身升级为仅使用四引擎运行将需要对飞机的系统和控制面（尤其是方向舵）进行进一步改造，从而延长了项目的持续时间、成本和复杂性。