IndiGo's formula doesn't sound too complex, and one wonders why some of India's fledgling carriers haven't followed suit.

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But on a recent winter afternoon Yasin's younger sibling was himself toiling over a vat of indigo dye in which the water hasn't been changed in a generation.

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Still, year wasn't all bad: Packer and his model wife, Erica, welcomed their first child, daughter Indigo, in July.

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