Timothy Andrew MacColl, 27, was last seen getting into a taxi about 2 a.m. on Sunday, May 27, his family said.

CNN: British sailor missing in Dubai

Yet air-taxi jets will have to prove near 100% dispatch reliability while logging 2, 000 hours a year, or the air-taxi operators won't buy them.

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The single biggest advantage of train travel is that it goes from city center to city center, without the need to arrive over an hour early, which in many cases can save you 2-3 hours of travel time (and taxi expenses) before you even count the travel itself.

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