Originally Posted by Juniper

Preferred Miles: When a Cardmember spends more than $25,000 in Net Purchases during a calendar year, 10,000 of those miles that have been awarded to your Account will be converted from base miles to Preferred Miles. Preferred Miles will be converted 4 to 8 weeks after the purchase requirement has been met.

Originally Posted by Bank of America

When Signature or Platinum cardholders purchase $25,000 or more each calendar year, 10,000 of those miles earned will be counted as Preferred Miles. Preferred Miles will be awarded 6 to 8 weeks after the purchase requirement has been met.