There is a banner at the top of my US-based homepage showing "Great Fares to London and Europe." Clicking through, I did not see any terms and conditions, just prices from various American cities. Dummy bookings made for late February show $1,072.43 roundtrip from JFK to LHR as well as BWI to LHR in WT+. Just $25 more for a booking from BWI to LHR from 3/16-3/25.