How do I find out exactly which plane will be used on my flights?

Does anyone know what aircraft/ rego will be flying virgin australia DJ 1365 from LST-MEL on the 3/09/2011 and DJ 849 From MEL-SYD on the 3/09/2011?

Not my specialty, sorry, Mitch. You might try the helpful folks over at the Sydney Airport Message Board forum, who often keep track of that sort of info.

thanks john, all ready tried YSSY Formun but no reply as of yet!

Both on a Boeing 737-700.

I don't think this info is readily available as airlines change their planes according to their needs (for other aircraft breakdowns etc.)