1.   All outgoing flights were grounded.

2.   Bad weather grounded his flight.

3.   Azmath and Khan may have had companions who went in different directions when their flight was grounded, according to sources with law enforcement and the airline industry.

4.   After their flight was grounded in St. Louis, they switched to an Amtrak train, which was going to San Antonio.

5.   All flights were grounded until at least Wednesday afternoon, according to news reports.

6.   But all flights were grounded indefinitely.

7.   But an ice storm had grounded all flights.

8.   But their plane, which made a scheduled stop in St. Louis, could not complete the trip after the Federal Aviation Administration grounded all flights.

9.   Clouds or fog can also erode the laser signal, grounding flights during such weather.

10.   Did the mail just pile up when the commercial flights were grounded last week, and even after limited air service became available?