One Mile at a Time noted yesterday that British Airways was now live as a U.S. American Express Membership Rewards transfer partner. I hadn’t expected this until January, they’re a few weeks ahead of schedule.

He also notes that they’re offering 5000 bonus miles for making your first transfer.

And, indeed, the Amex Membership Rewards website says:

“In honor of this new partnership, you can receive 5,000 bonus BA Miles when you transfer Membership Rewards® points to British Airways before January 31, 2010. You must be enrolled in the British Airways Executive Club in order to participate in this offer, visit http://www.ba.com to enroll. Bonus Miles will be awarded by February 28, 2010. One bonus per Cardmember. Taxes, fees, charges & surcharges, including airline surcharged, apply.”

So I can transfer 1000 Amex points to BA and receive 6000 miles.

As I noted back in August, I consider Amex adding British Airways to their U.S. program to be a real, meaningful addition. Truly glad to see it.