Surface transportation between any two points served by DL/AM/CO/NW is permitted. A void coupon which indicates a surface segment will not be considered as a flight coupon.

• 旅客到达某一点后未能搭乘首个有座位的定期航班离开的，或者是下一个定期航班在旅客到达该点后四小时内才离开的。