求翻译：欢迎你乘坐中国重庆航空公司航班由重庆前往伦敦（中途降落加拿大）。由重庆至伦敦的飞行距离是三万六千千米，预计空中飞行时间是12小时34分。飞行高度2万4百米，飞行速度平均每小时50公里。是什么意思？

CHONGQING, China welcomes you aboard Airlines flights from Chongqing to London (Canada) landed at midway. The Chongqing to London flight distance is 37,000 m, it is expected that Air flight time is 1 hour 34 minutes. Flying at 20,400 meters, average speed 50 km per hour.

Welcome by Chongqing Airlines flights from Chongqing to China London (midway landing Canada). Flight distance%