Magellan Aerospace has told workers 240 jobs are under threat at sites in Wrexham and Deeside - according to the Unite union.
The firm - which employs around 500 workers in North Wales and is a major supplier to Airbus -
Now Unite has said it had been informed that 240 roles are at risk.
Peter Hughes, Unite Wales regional secretary, said: “Today’s announcement by Magellan is devastating news for the workforce at the plant. The proposed scale of these redundancies would affect almost half of the current employees. The potential economic consequences for the economy of north east Wales are huge.
"Whilst Unite recognises that there is intense pressure on the aerospace sector at present, it is crucial that Magellan is in a position to pick up production levels quickly once the pandemic and its effect on the sector eases.
"If Magellan loses almost half of its highly skilled workforce, then bouncing back in a post=Brexit economy becomes extremely difficult."
He added: "Unite will be doing everything possible to support our members during this difficult and worrying time."
A Welsh Government spokesperson said: “Today’s news is extremely worrying for the Magellan workforce, their families and the community. This important business has been a cornerstone of the Airbus supply chain for many years and has world beating design and build technology that must not be lost.
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“The announcement underpins the fragility of the aerospace sector globally with a dramatic reduction in demand for commercial aircraft. The Welsh Government will continue to do all it can to support the company and the workforce, but time is running out for the 海角视频 Government to intervene as other national governments have around the world.
“Welsh Government Ministers have constantly impressed upon 海角视频 Government counterparts the need to support the long term future of the industry, by developing a package of interventions to match what the French Government and others have already announced.”
Magellan response
They responded on Friday morning with this statement:
They said: "The coronavirus pandemic is having an unprecedented impact on the aerospace industry as a whole which has affected the Magellan Aerospace (海角视频) Ltd business.
"Because of the pandemic, customers have significantly decreased their orders for Magellan’s products resulting in reduced business levels.
"Since the outbreak of the pandemic the business has remained in full dialogue, having regular meetings with all customers to gain a better understanding of both current and future demand levels.
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"Based on future orders from customers for the remainder of 2020 and 2021, the business has been forced to review operations.
"Magellan is presently consulting with Unite Union at local and regional level and non-union representatives regarding the current business situation. These talks will remain in place and the business will endeavor to mitigate the proposed 240 job losses.
"Employees are a key part of Magellan Aerospace. Magellan’s leadership team has managed through several economic cycles in the past and remain confident the company will weather this storm and are committed to ensure that Magellan maintains production capacity, long-term backlog, financial liquidity and will be part of the local community for years to come."