Effective Jan. 1, 2012, Delta SkyMiles American Express Gold cardholders will no longer be able to earn miles through the card’s Miles Boost feature. The Miles Boost feature allowed cardholders to earn up to 10,000 bonus miles (redeemable and not elite-qualifying miles) per year–5,000 bonus miles after spending $15,000 a year and another 5,000 bonus miles after spending $25,000. The elimination of Miles Boost only applies to the Delta SkyMiles Gold card ($95 annual fee, waived the first year). Platinum cardholders ($150 annual fee) can continue to earn up to 20,000 MQMs each year and Reserve cardholders ($450 annual fee) can earn up to 30,000 MQMs each year.