Airline S7  has decided to use ethereum blockchain to sell flight tickets. 

source :  https://goo.gl/YWJBfC 

S7 Airline is a Russian Airlines. News coming from regional news agencies stating that PJSC Siberia Airlines, known as S7, and Alfa-Bank begun the project of selling airline tickets on the blockchain on Monday. According to the bank, one of the key advantages of employing the technology was the process of faster payments.

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