Then Booth's categories, which reflect wealth (and, in the case of the lowest class, morality) must be aligned with the census categories, which record socio-economic status.

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But when you peel back their lofty status and record of home runs you usually see a series of hits, misses, whiffs and foul balls along the way.

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British Airways started rolling out iPads to 2, 000 senior cabin crew in late 2011 and are now using them across their entire fleet to tap into customer data, check member status and record meal and beverage preferences, as well as keep track of transfer and final destination details.

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