If you are saying CASA made decisions purely for the purposes of giving one operator a commercial advantage over another, I say CASA is not allowed to do that.
But you must take care not to mix up cause and effect. Decisions on safety grounds almost invariably have commercial consequences.
Lots of information gathered by CASA for safety purposes is of commercial value to the persons (including commercial entities) to whom that information relates. For example, an operator may have gone to a lot of time and expense to develop an operations manual submitted to CASA to support an application for an AOC, along with financial viability information. CASA is obliged to treat that information as confidential, and is entitled not to disclose documents containing that information on the grounds that it is commercial in confidence, notwithstanding the documents may be within the scope of an FOI request. That’s unless there’s consent to disclosure.