Hi Punk
I have a couple of comments to add:
I have not worked for NATS but have worked fairly closely with them. I can confidently say that you are unlikely to find a worse organisation to work for than AirServices Australia. Their treatment of staff and industrial relations are appalling and you only need to read some of the threads on here to establish in what low esteem they are held by their employees. The only thing that makes working for them in any way whatever worthwhile is the job itself and the environment / lifestyle.
Second, while not wishing exactly to contradict, Loxley is likely to be wrong. It would not be the top 12 from the Order of Merit that get the slot, it will be the 12 whose brother / father / sister / wife etc is already a controller with AsA, or who ´knows´someone. That is how it works. Nepotism is rife.
Consider it carefully!