Airbus has said it will reconsider investment in the UK if Britain leaves the European Union.
President of Airbus UK, Paul Kahn said Britain must compete for international investment.
"The best way to guarantee this is by remaining part of the EU," he said.
Airbus is the world's second-largest plane maker and employs 6,000 people at its site at Broughton, north Wales, where it assembles the wings for all Airbus aircraft.
Mr Kahn added that if Britain were to leave the EU, the company would not suddenly close, but said Airbus would “absolutely” reconsider future investment in the United Kingdom if, after an exit from the European Union, economic conditions in Britain were less favourable for business than in other parts of Europe.
If Britain were to leave the EU Mr Kahn suggested the company could face more red tape in areas such as work visas and trade barriers.
He said he was not "blindly supporting Britain's membership of the EU", adding: "I welcome the UK government's intentions to deliver positive and hoped-for reforms - which would create a leaner and more efficient EU."
