This mob remind me of Orion, the hybrid charter tour operator come scheduled carrier from the 80's.
After a steady period of growth and modest success they reached critical mass. Wild fire rumours of bigger better aircraft, a couple of big airbus pitched up. Within two years they were taken over by Brittania.
Horizon Travel, Holiday Tour Operator, created Orion, their in-house airline. Both traded very successfully and were eventually sold to the Thomson Travel Group, who own their own in-house airline, Britannia, all of which is now owned by TUI.
The JET2 "mob" are as successful as the foregoing companies, acccording to their published public company accounts. Furthermore JET2 did not lay off 100+ pilots in the last economic crisis, as did Thomson/Britannia.