Weasel Words.
Howard mastered the government being "committed" to doing something. It doesn't mean it will be doing it, and there is no accountability if it doesn't. This approach has been adopted by all and sundry since. You can't be accused of breaking a promise made with a commitment.
Jetstar is no different. The company is aiming for something which on the surface sounds good. It doesn't have to reach the 50% goal, and if it doesn't, it still looks good for trying.