If you our a British Airways credit card holder (like the one I talked about in this mornings post) you are able to get 10% off a paid fare ticket. I received an email yesterday letting me know that they have extended this offer for travel for all of 2013!
You will save 10% on the ENTIRE purchase price, this includes any taxes, fees, etc. The promotional code is also good for a reservation consisting of up to 8 passengers on the same flight. This is only valid for British Airways operated flights and not for codeshare flights that can be booked through the BA website. This is valid for business class fares as well!
This offer is only valid for new bookings made by US residents paying in US dollars with a valid BA Visa credit card. You must be starting your travel in the US as well.
For flights to/from Europe, this could easily knock off $100 +/- from your flight cost.