But aviation experts say that the truth about what happened to flight 447 May never be known.

不过，航空专家认为，航班447究竟发生了什么或许永远不得而知。

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Aviation experts are reiterating that at this point too little is known to draw any conclusions.

航空专家再三重申，目前了解的情况太少，还不能下任何结论。

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Some aviation experts agree pointing out that dozens of airports up and down the East Coast were swamped with snow.

一些航空专家指出东海岸许多机场被大雪掩埋。

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According to Learmount, many aviation experts have yet to rule out the human factor.

CNN: Has Air France Flight 447 mystery finally been solved?

Despite the flurry of reports, aviation experts say most new commercial airplanes do encounter problems after their launch.

CNN: STORY HIGHLIGHTS

Aviation experts say the airlines shoulder some of the blame for the delays.

NPR: Holding Pattern: Flight Delays are Going Up, Up, Up