This may not come to anything, however I'm getting some interesting search results when looking at LHR-LAX in J for next year.
I can't get Matrix, BA or AA websites to pull anywhere close to this fare up so I'm not sure where Kayak has got these numbers from. Closest I came was on an OTA site using a Finnair codeshare of the AA flights which priced up at around £1100. Maybe one to keep an eye on....