31.  Training flights and operational flights comprise all aviation activity in the military.

32.  While training flights are a large portion of all flights, Pentagon officials could not immediately say what percentage of flights would be affected.

33.  A British helicopter crashed in the Adriatic Sea while on a training flight Sunday, killing four of the five crew members aboard, officials said.

34.  A British helicopter went down in the Adriatic Sea while on a training flight Sunday and four crew members were killed, police said.

35.  A British helicopter went down in the Adriatic Sea while on a training flight Sunday morning and four crew members were killed, police said.

36.  A British helicopter went down in the Adriatic Sea while on a training flight Sunday morning and four crew members were missing, U.N. spokesman Chris Gunness said.

37.  A German army helicopter crashed Monday during a training flight, killing three soldiers and damaging three houses, one of which was nearly destroyed, authorities said.

38.  A aircraft crashed on a training flight Friday, killing the two people on board, the National Search and Rescue Agency said.

39.  A British helicopter went down in the Adriatic Sea while on a training flight Sunday, killing four of the five crew members aboard, officials said.

40.  A Pakistan military plane crashed Thursday while on a training flight in eastern Punjab province, killing the two men on board, military officials said.