Don't forget that the American version of Open Skies is one tilted 90 degrees in their favour.
They expect - nay, demand access to LHR for their carriers (LHR being the world's premier intercontinental hub) and in return are NOT prepared to provide the following:
1) Cabotage or derived fifth freedom rights
2) Wetlease of UK aircraft to US carriers for operation within the US (despite the fact that there are many N registered aircraft flying over here - including for BA)
3) Abolition of the 'Fly America' policy
The only company to gain from this travesty would be BA, and we know how much they care about competition (hence why they are trying to push Tone to expedite this through).
Sod 'em.