The three-letter airport code on the tickets issued to the couple by the airline read DAC, the code for the airport in Dhaka.

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The new alliance, that works like a code-sharing airline alliance, means travelers can book tickets on a multilingual website to 100 cities, rising to 400 by 2020.

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When the bag is checked in, the tag is applied, and the airline's computer systems associate the tag's code with the passenger's electronic ticket.

ECONOMIST: REPORTS