In the contract you signed, it should spell out EXACTLY what the penalties are for leaving.

The previous contract I signed was a "training bond" that spelled out, word for word, what I would be responsible for if I left early. It also listed several things that, if they happened, I would be let go without having to repay the contract. Such things included a loss of medical, firing, etc.

If I were in your position, while flying his shiny king air, I would go to great lengths to make him pay for his big ego. I would fly faster, lower, and less efficient. I would use beta until I slowed to a crawl, not caring about the props. I would leave a LARGE berth between thunderstorms, and go COMPLETELY out of the way to avoid them. Above all, I would do this while still acting in a professional manner including smiling and nodding at all times so as he would not catch on...you can possibly create your own little "job action" LOL.

That being said, you DID sign a 12 month contract and did, as part of YOUR agreement, say you would stay.