ashcloudA large ash cloud from a volcano in Tonga is starting to affect flights in the region and aviation authorities have issued an alert. Air New Zealand said the volcanic activity had caused the cancellation of some services between New Zealand and Tonga. Flight NZ970 operating between Auckland and Nuku’alofa yesterday was diverted to Samoa and later returned to Auckland. The return leg – flight NZ973 – from Nuku’alofa to Auckland was also cancelled, the airline said in a statement. An additional return service which was due to operate today has also been cancelled. Today’s scheduled return service NZ970 Auckland – Tonga and NZ973 Tonga – Auckland had also been cancelled, the statement said. More