If you would read the above link you would know that Cathay Dragon applied in January 2017 to fly to the USA and got US DOT approval on June 29, 2017.
I am pretty sure the Cathay group would not spent all that money to get approval and actually not fly to the USA. Cathay Dragon also got approval to fly from point to point in the USA for 1 sector before returning to Hong Kong.
Cathay Dragon also provided a proposed flight schedule to the US DOT which they requested to be confidential and as such has not been published by the US DOT.
"The United States Department of Transportation (DOT) announced on June 29, 2017 that Cathay Dragon has been approved to begin service from to the United States under exemption code 49 U.S.C. §40109 and amended foreign air carrier permit under 49 U.S.C. §41301.
The Hong Kong-based carrier filed to operate flights to the United States on January 12, 2017. The DOT approved the request under the 1997 Agreement between the Government of the United States and the Government of Hong Kong Concerning Air Services."