American Express Membership Rewards members can earn 30 percent additional bonus points when transferring their points into Avios through Jan. 14, 2013. In the past, American Express Membership Rewards has offered transfer bonuses of 40 and 50 percent, but it’s anyone’s guess when or if they will offer similarly high bonuses. If you need some Avios points, a 30 percent bonus isn’t bad. Points transfer at a 1:1 ratio so you’ll receive 1,300 Avios points for every 1,000 points transferred until Jan. 14, 2013.