[BITList] Who, What, Why: How are cockpit doors locked? - BBC News

[Michael Feltham]

> http://www.bbc.co.uk/news/blogs-magazine-monitor-32070528 <http://www.bbc.co.uk/news/blogs-magazine-monitor-32070528>
> 
> Who, What, Why: How are cockpit doors locked?
> 
> 
> 
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