While I agree with FITS that spending any money brings forth a visceral reaction from management, there are some differences between airlines. Some operate with only the FAA regulations as limitations while others have contractual limits set within the union contract. Those airlines operating at the FAA limit will see their 'advantage' disappear while management at those with a better union deal will worry that at the next round of contract talks it will get even worse since "we have to be better than the FAA minimums."