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We've posted a more detailed explanation with screenshots and examples here:

Your screenshot shows the tooltip visible, which aren't by default (as already noted by a couple of commenters already).

Someone on twitter mentioned that they had bought some flight tickets only because of this 'confusion' : https://twitter.com/#!/jayeshb/status/162512878287589377

Is that a one-off case because of confusion?

We only launched this feature last week, so it's hard to say whether it's a "one-off" case.