Since the political and legal systems are different between mainland China and Taiwan, conflict of laws issues arose in both public and private air transport laws after the launch of direct routes. Three models can be used as solutions to these issues: uniform substantive law, conflict of laws, and agreements by private institutions. The uniform substantive law model is ideal but not feasible; the conflict of laws model is possible but not realistic. The agreements by private institutions model respects private autonomy, which seems to be a supplementary yet feasible option with fragmented and conservative characteristics. Based on the characteristics of each model, the ideal way to solve this issue is to prioritise the model of agreements by carriers at this early stage and, finally, to consider uniform conflict of laws rules or substantive law when the opportunity is mature or the ultimate reunification is realised.