飞行状态范围 meaning in English

flight envelope
flight limits

" the cnsatm has immense benefits in enabling aircraft to operate more frequently within their most optimum flight envelop , while minimising airspace constraints , and reducing traffic congestion . it also commensurates with achieving a marked increase in flight safety
该系统不但能容让航机在最佳的飞行状态范围增加飞行次数，把空域限制减至最少，纾缓航空交通挤塞，而且更可显著提高飞行安全。