Aerocare another major player in the subcontracting ground crew game. Check their website for applications.
Expect about 34k/year as a casual - permanent/part time positions come up after you've worked for them for a period of time. I had a blast for the year I was ground crew, but it wasn't so much the company, as it was the people I worked with (like anywhere I guess). Cons of the job - shift work (4am - 1pm, 10pm - 2am - same day).
Good luck!