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Subsequently, they found eight of the 12 toilets in business and economy class could not be used, "causing discomfort to all on board".

A premium class seat is responsible for releasing five to nine times more carbon than an economy class seat.

In economy class there are five seats in each row, three on one side of the aisle and two on the other.

It added that in economy class, several cups of noodles are all served at once, saying that the "risk of burns is greater with passengers crowded together".

But when Duben tried to redeem his loyalty points for an economy class ticket to Japan recently, he was stunned that his airline more than tripled the miles he had to pay.