Arrowhead
You may be correct as there’s no provision in the Macau Basic Law regarding airline ownership. Air Macau after all is 51% owned by CNAC. I have my doubts though whether Macau will become a viable low cost airport to Hong Kong as the inconvenience and cost of road transport will be a major problem. Once the bridge is finished the cheapest method to travel from Macau Airport to downtown Hong Kong will probably still be by ferry, not by bus. If the HKSAR and the Macau SAR had decided to put in a rail crossing with the new bridge my point of view would be different.