Both Qantas and Virgin have different registrations for their 737 fleet for a variety of reasons. Being Intl/over water configured, engine thrust rating, different flaps like on the VZ series etc. That is why the different rego blocks are used. The other limiting factor is that CASA will not reserve a rego unless you have an aircraft already purchased and has a c/n. It is on the CASA website, or at least used to be.
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