I'm not aware of any concessions that the Europeans would have received that we did not receive. In fact we would have received the concession of the Canadian-city-to-Canadian-city exemption.
The law itself, the final rule, is a law of the United States. I don't really see how the government, the administration, the White House, or whoever could provide any further exemptions in that respect.
Perhaps some of the officials might respond to that.