BBC News report
Police are investigating reports of drunk and disorderly behaviour on board the helicopter service from the Isles of Scilly.
Staff at British International helicopters in Penzance called police to the heliport at around 1900 BST on Friday. Nine people were detained overnight at Camborne police station and one was released on police bail.
Police were called when they tried to open a window on the Sikorski helicopter while it was in mid-air. They had already been barred from ordering alcoholic drinks at the airport bar at St Mary's. The arrested men were part of a 15-strong group who were celebrating a 21st birthday.
The aircraft was met by police as it landed at Penzance. The men, all in their 20s or early 30s and from Cornwall, were arrested under the Aviation Security Act and could face jail if they are charged with endangering the aircraft.
Devon and Cornwall police spokesman WPC Sharon Newman said inquiries suggested the men were in a group who had been drinking on St Mary's earlier in the day. She said: "During the flight 10 men allegedly became disorderly and attempted to release one of the emergency window pulls and minor damage was caused to the window."