Build a team. Don't treat any of the working groups as adversaries. In order to do this, it will take something very rare in business management and even more rare in airline management; don't lie to or double-cross your employees! You can not substitute impassioned letters from the senior leadership of the company to the workers about their "integrity". No matter how great the temptation, practice treachery or deceit once, and it will never be forgotten or forgiven. You've poisoned that waterhole.