DADDY-OH
I reckon a route to Poland would work from BLK - or any airport for that matter. I myself would not go there, but I know quite a few who would.
Aside from that though BLK lacks the bucket and spade brigade that JET2 are looking for in particular with their package holidays. trouble is IMO and JET2 know this, BLK caters for a specialist second home market IMO.
That's why Prague nor Amsterdam never worked, or for that matter London from BLK.
What does puzzle me though and bucks the trend above, was the axing of Ibiza Mahon from BLK, why would JET2 do that when pax was holding up? - And hoist Jersey on BLK another route IMO that won't work.