That one tweet seems to imply that bonuses were and I suppose now still will be automatic. Automatic bonuses are basically worthless in terms of encouraging good performance because they just end up being considered to be a part of people's salaries i.e. something people feel entitled to regardless of their personal performance. That sense of entitlement certainly came through in a few of the more outraged posts about it.
UA might keep hiring the wrong CEOs, but maybe it's because trying to manage a company with an entrenched union workforce full of 40+ employees that will place their personal benefits and perks above anything else is like trying to catch a greased up pig.