I see Air Wales today have finally formerly announced the Cardiff- Brussels twice daily flight
The network that you mention Merchant Venturer could only work if heavily subsidised, Maybe a route on Mondays and Fridays only would be sufficient as rumour has it that it is for the benefit of Welsh AMs, and as they are very good at spending tax payers money on white elephants in this Country, they would think nothing of spending inordinate amounts of Welsh Taxpayers money on projects which benefit few, whereas if they help fund the long overdue motorway link from the M4 to Cardiff Wales airport it would have a major impact on the Welsh Economy.