Source: Simon Hradecky | www.avherald.com

An Iberia Airbus A330-300, registration EC-LUK performing flight IB-6166 from Boston,MA (USA) to Madrid,SP (Spain) with 294 people on board, was climbing through about 10,000 feet when smoke surfaced in the cabin prompting the crew to declare Mayday, don their oxygen masks and initiate an immediate return to Boston. The aircraft landed back on Boston’s runway 22L about 16 minutes after departure. After landing the crew advised emergency services there was still electrical smoke in the cockpit, however, they were able to taxi to the apron unless emergency services determined an emergency evacuation would be needed. Following checks by emergency services the aircraft taxied to the apron.

Passengers reported there was smell of burning at first, then white smoke surfaced.