I'm in kind of a similar situation as you but I'm in my 50's (but a lame). If I get made redundant (which is likely to happen in the next 5 years if things dont improve) I wouldn't mind getting into GA. I don't know what your chances are like getting into Qantaslink in your 40's, but I know a lot of GA operators who would prefer to take on someone your age rather than someone in there 20's. BUT you will have to be willing to work somewhere outside of a capital city for a few years before getting a gig at bankstown airport for example unless you are lucky and have good contacts.