European aircraft maker Airbus has warned that it could move wing-building out of the UK in the future if there is a no-deal Brexit.
The firm's chief executive, Tom Enders, said the firm "will have to make potentially very harmful decisions for the UK" in the event of no deal.
Enders said it was a "disgrace" that businesses could still not plan for Brexit.
In all, Airbus employs 14,000 people in the UK.
That includes 6,000 jobs at its main wings factory at Broughton in Wales, as well as 3,000 at Filton, near Bristol, where wings are designed and supported.
Enders said: "Please don't listen to the Brexiteers' madness which asserts that, because we have huge plants here, we will not move and we will always be here. They are wrong."
Airbus's latest intervention follows announcements by two other companies that they were moving their headquarters out of the UK.
Sony said it would transfer its European HQ from the UK to the Netherlands to avoid disruptions caused by Brexit.
And appliance maker Dyson announced it was moving its headquarters to Singapore, from Malmesbury in Wiltshire, although it said the decision had nothing to do with Brexit.
However, another firm, Japanese technology company Fujitsu, told the BBC it had no intention of shifting its operations out of London.
Duncan Tait, Fujitsu's European boss, said it had "a thriving business in the UK," adding: "We're recruiting people every week."
Enders said that while the world's second-largest aerospace group could not "pick up and move our large UK factories to other parts of the world immediately," Airbus could be "forced to redirect future investments in the event of a no-deal Brexit."