Originally Posted by
cessnarocket
http://www.routesonline.com/news/38/airlineroute/272544/thomas-cook-uk-schedules-belfast-cancun-in-junejuly-2017/ There is your union flag carrier
This was announced in April 2016 and operates Jun-Jul 2017. The Routes article also mentions that they forgot to mention it last year, which is why they're writing about it now. The topic probably came up at the Routes event this week.