The rollout of the Advance Customs Information (ACI) customs system to air freight has been pushed for a second time (Externer Link) to give importers, customs brokers, shipping agents and overseas companies more time to get used to the system amid volatility in the global economy, the Finance Ministry said in a statement (Externer Link) . Use of the ACI for air freight was due to become compulsory on 1 January, having already been pushed back from an original October start date. The ministry will now extend the trial period until local and global conditions are stable, the ministry said.