Delta are now wearing the trousers. Any time they want VAA to start a new route/add a service then something will go as there are no more slots at LHR. With the 787 the NRT, CPT would have been profitable, but the USA routes even more so.
This now leaves VAA vulnerable to a USA downturn. Something they said was would never happen again post 9/11...Delta would just hide behind Chapter 11.