他确定订到了下午的一趟班机，但决定在机场订到更早一班的飞机。
He had confirmed reservations for an afternoon flight, but decided to try to try to board an earlier flight on standby.
从圣安东尼奥到墨西哥城的航班每天只有三、四趟，到蒙特雷（墨西哥东北部城市）也只有一班。
San Antonio offers just three or four daily flights to Mexico City and only one to Monterrey.
每小时列车整点发一班车，所以下趟车在20分钟后出发。
It runs every hour on the hour. So the next train leaves in 20 minutes.
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