The three slots controlled airports in the US is JFK, LGA and Washington National.
If my readings are correct, slots at LHR are not sold, however, dealings do transpire between air carriers for slots and/or times.
As I said, it is doubtful that US air carriers will be buying slots at LHR, one since that is not how it is done and secondly, because there supposedly are none. The US air carriers will undoubtedly be demanding accesss to LHR, so I guess the slots will simply have to be found.
I don't think DAL, NWA, CO will buy the argument that they simply cannot have access, I knowI wouldn't if I was them.
I guess BA, VA, BMI will have to give up slots.
The EU have been pushing for open skies, Rod has been most outspoken about it, well, it is a give and take. Restricting access to LHR will simply not work!