IOM
Flybe struggled to fill a Q400 on IOMLTN, I don't think that route warrants an A319. Smaller aircraft than a Q400 would work better.
Then you have the LGW. The summer schedule is not ideal for the suits on the island, which is why BA Cityflyer have stepped their schedule back up to 3xDaily M-F, the aircraft type is still to be confirmed.
What I do think would work is a series of Sun routes through the summer and from the IOMTT.
Albastar operated on behalf of Thomas Cook through August this year, and the loads were very impressive, talking 160px on average each week. We have a local travel agent who Flybe work with during the summer, and the vast majority of weeks, the Q400 is full as can be. That was with Albastar/TCX operating at the same time.
I'm just not sure what sort of schedule it would be, 1/2 per week tops.
Just a thought.