Phoenix Salon announcements once every six months when the season (see http://FFP.airchina.com.CN/CN/lcdh/main.jsp),
In Exchange for starting during the off season tickets, some routes have 50% off
In 2016, the territory of China from 16/5 to 30/6 and from Japan Airlines, are available at half price in Exchange for only 22500 miles (original 45,000),
Tax RMB 854.
Only due to Air China Beijing/Shanghai to Japan direct flights to Beijing/Shanghai,
Lian air spring airlines currently operate the Macao-Shanghai flights (back and forth about MOP 2000)
Due to the total costs about MOP 3000, and transit, is consider to play in Shanghai, and then to Japan, it will be worth it.
Otherwise, it doesn't have to be with friends miles for tickets.