a travel writer for the AJC, Clara Bosonetto Maerz, posted a local story on this with a few more details:
"One-way rates, based on a round-trip purchase, start from $407 on Sept. 2-Oct. 20 departures. Depart during the low season, Oct. 21-Dec. 19, for one-way rates starting from $299. Fares do not include government fees and taxes of approximately $165. Additionally, travel on Thursdays-Sunday is $30 more in each direction.

Qualifying airfare requires a stay of at least one Saturday night. Stays of up to one year permitted.

The two free nights hotel accommodation is based on double, triple or quad occupancy at participating hotels. Stays must be on consecutive nights at the same hotel. Hotel stays must be booked at the same time as the airfare. Solo travelers are entitled to a maximum of one free night at participating hotels. Choose from a wide range of select three- and four-star hotels ranging from traditional to boutique.

To save an additional $20, simply log in or register and book your travel at BA.com through Aug. 19. If you book through a British Airways call center, you will be charged an additional $20 per ticket for processing."