My guess wood be that Flybe get a % of the air fares collected, for that Stobart will get a degree of marketing support and distribution services.
I would hope that Stobart have done their research as to what industries and agencies exist in the great area and reached agreements on price etc... Some good corporate contracts could make all the difference. These routes also look like mostly outbound traffic from the UK, which probably makes more sense, as the cost of marketing abroad from could be expensive and potentially less impactful...