AAdvantage members flying with either AA or BA on routes to the US from Heathrow, London City or Manchester can earn up to 150,000 bonus miles over the next two months. As flagged up in our forum, UK-based members will earn 25,000 bonus AAdvantage miles for their first eligible return trip, 35,000 for the second trip, 45,000 for the third, and another 45,000 for the fourth, making a maximum of 150,000 bonus miles available. The offer is valid for members travelling on full fare economy, business class or first class tickets (fare codes Y, B, F, A, J, R, D or I on AA-operated flights, and W, E, T, Y, B, H, F, A, J, R, C, D or I on BA-operated services) by December 31. Travellers will need to pre-register for the promotion here, using the code UK150. Visit aa.com, ba.com.