adj.不拥挤的；宽敞的
The CAB did not regulate rates, but it controlled entry into city pairs and used that control to limit entry to the point that flights were frequent and uncrowded. 民航局没有对费率进行管制，但是它设限进入大城市并一次把门槛设定到航班重组而且不拥挤的水平。
