Yes they are, and the most recent responses from the airlines in the media are;
Emirates:"Belfast is not currently on our radar" - May 2017
Etihad Airways: .....
Qatar Airways: "considering daily flights to Belfast" - June 2016
I doubt that BFS will secure a Middle Eastern route until the airport has cemented itself in the > 6 million passengers category (ie post 2020), but given most recent route announcements, I'd say B788 QR will be the airport's best bet.