21.   Other airlines grounded flights around the same time.

22.   Other airlines grounded some flights around the same time.

23.   Outgoing flights were grounded during the evacuation, and incoming planes were diverted to other areas of the airport, which was jammed with Christmas Day travelers.

24.   Peru farmers cannot quickly step up coca production while the surveillance flights are grounded.

25.   A power outage caused by a transformer fire grounded flights at Logan International Airport and caused delays on public transportation in the Boston area Thursday.

26.   Aid flights were grounded Sunday so that U.N.-authorized peacekeepers could be sent in to bring a halt to the attacks by pro-Indonesia militias in East Timor.

27.   All domestic flights were grounded.

28.   All Air France Concorde flights have been grounded since the crash.

29.   All airlines, including the low-cost carriers, were hurt by the declining economy and the two days flights were grounded after the terrorist attacks.

30.   Among those companies directly affected by the terrorist assault were airlines, which grounded all flights to North America due to the closure of U.S. airports.