Davos, Switzerland (CNN Business) Airbus and Ford have issued stark new warnings about the dire consequences of Britain crashing out of the European Union without a deal to protect trade links and supply chains.

Airbus CEO Tom Enders said in a video published on Thursday that a disorderly split would cause Airbus to redirect future investment. The planemaker could not guarantee its existing factories would survive long term.

Ford ( F ) said that a 'no-deal' Brexit would cost it $800 million in 2019. The estimate reflects the cost of new tariffs and expectations that the British pound would decline in value, a Ford spokesperson said.

The interventions by two major manufacturers will heap pressure on Prime Minister Theresa May to rule out Britain leaving the European Union without an exit agreement in place. But May is fast running out of time. Brexit is due to take place on March 29, and the deal she negotiated with EU leaders has been rejected by UK lawmakers.

The stakes are high. Airbus employs 14,000 people in the United Kingdom and Ford has 13,000 workers in the country. They support tens of thousands more British jobs through their supply chains.

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