 On 28 March 2010, the Civil Aviation Authority of Macau ordered Air Macau to cancel its sub-concession agreement with Viva Macau, alleging that Viva Macau failed to adequately assist passengers affected by flight delays and cancellations.The government then quickly revoked Viva Macau's Air Operator's Certificate saying that without a sub-concession, the airline was not compliant with the requirements for public air transport services.The action is currently under appeal in the Macau courts and has raised questions for foreign investors regarding Macau's regulatory environment.