21.   A task force was being formed to interpret the voice recorder, he said.

22.   A team of air-accident investigators has discovered that unused tracks on cockpit voice recorders can reveal when an aircraft is about to suffer a catastrophic structural failure.

23.   A TRAGIC ECHO Airplane voice recorders often help investigators understand why a crash happened.

24.   Afterwards, the statement said, there were two apparent interruptions of power to the cockpit voice recorder.

25.   But in the cockpit of the KLM jet, the voice recorder picked up only a loud screech.

26.   But in this case and the Dominican case, the safety board offered to analyze the flight data recorders and cockpit voice recorders because the planes were manufactured here.

27.   But the recovery of some wreckage and the chance that the flight-data and cockpit voice recorders might soon be found appeared to represent significant early progress.

28.   But there was still no sign of the cockpit voice recorder.

29.   But then, the Panasonic lets you assign names to files only on a computer, a feature that somewhat defeats the point of owning a portable voice recorder.

30.   But there is still no sign of the cockpit voice recorder, which investigators say would be extremely helpful in establishing more conclusively what happened.