Hong Kong Express Airways have ”Buy one Get one Free” on December 13, 2016.
This is the sale that one becomes free by the reservation of two people.
・The Japanese route
Sale period: Dec 13, 2016. – Dec 15, 2016.
Travel period: Jan 1, 2017. – Nov 30, 2017.
Hong Kong Line of approximately one year is a sale.
Sale is applied with reservations of multiples of 2.