Dunno who's behind them Nige, but they sure are pricey!! Probably someone who's trying to make a kiiling out of the half term holidays. The Jersey half term is a different week to the UK one, so they will probably be able to get an aircraft at a bargain price!!
Seems as though they don't plan to operate all three flights, but are merely seeing what the demand is like. I would imagine if you managed to find 45people and approached Atlantic, they would get a charter at a bargain price, as the aircraft sits in JER for a lot of the day!!
Take Estrella for excample, they charge similar prices and fill the aircraft every week. They must make a FORTUNE!! Seems as if these guys are trying the same thing!! Hardly rocket science, and a good money spnner if you can stimulate demand!!