定期航线

例句：

1. 1. The airline has announced a new route for its regular flights.
   航空公司宣布了其常规航班的新路线。
2. 2. He planned to take the regular flight to his destination.
   他计划乘坐常规航班前往目的地。
3. 3. The airline has made changes to its regular routes due to weather conditions.
   由于天气条件，航空公司已更改其常规航线。