'This scenario would force Airbus to reconsider its investments in the United Kingdom, and its long-term footprint in the country, severely undermining United Kingdom efforts to keep a competitive and innovative aerospace industry, developing high value jobs and competences'.
"Given the "No-deal/hard Brexit" uncertainties, the company's dependence on and investment in the flagship Wing Of Tomorrow programme would also have to be revisited, and corresponding key competencies grown outside the UK".
The United Kingdom's Brexit plans hit another major bump Friday when global aviation giant Airbus threatened to pull out of the country if the government leaves the European Union without a deal on future trading relations.
Airbus said it is facing a variety of decisions, including whether to invest in future manufacturing capacity, the need to build up stocks of components in the event of border delays, and how to ensure parts are certified by aircraft regulators in the future.
This is not a shock in that Airbus has been warning for years that it might be less likely to invest in Wales and the rest of the United Kingdom in future if it doesn't have easy access to the EU.
The UK government is considering two other options: a customs partnership that would remove the need for new customs checks at the border; and a "highly streamlined" customs arrangement that would minimise customs checks rather than getting rid of them altogether.
Airbus, which employs 15,000 people at 25 sites across the country, warned that this was "no idle threat".
Tory former Welsh secretary Stephen Crabb said the firm's warning should be a wake-up call for ministers.
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"Put simply, a "no deal" scenario directly threatens Airbus' future in the United Kingdom", said chief operating officer Tom Williams.
She said the government had been made well aware of the company's views during "extensive and frank" discussions.
We have sought to highlight our concerns over the past 12 months, without success.
"The UK can not take the economic risk of cutting ourselves adrift", it said.
It has been a source of exasperation for some cabinet members that although many companies have privately expressed concern - even alarm - at the progress of the Brexit negotiations, they have been reluctant to make their fears public, and have even dialled down the shrillness of their warnings when meeting the prime minister in person.
"There is an open dialogue there and we continue to talk to them".
It's not just in Brussels where May's government is struggling to make progress. "A pragmatic, sensible Brexit that protects trade and jobs is vital".
The company has said it could drop plans to build aircraft wings in British factories because of uncertainty about post-Brexit regulation and customs procedures, moving production to North America, China or elsewhere in the European Union instead. "We seriously believe a no-deal Brexit would be catastrophic".
Shadow Brexit secretary Sir Keir Starmer said May needed to drop her Brexit "red lines".