Union bosses say the future for BAE employees is once again uncertain after plans to sell the plant in Brough were announced.
Part of the site will be redeveloped while the rest is leased back to the aerospace giant. It's claimed the move could bring employment and a boost to the local economy - despite the hundreds of people who have been made redundant in the past 18 months.
Defence giant BAE Systems has won a £2.5 billion deal to sell 20 aircraft to Oman, helping to sustain thousands of jobs in the UK including their site at Brough in East Yorkshire.
The contract for 12 Typhoon and eight Hawk aircraft was welcomed by Prime Minister David Cameron, who will visit the Middle Eastern state today.
BAE said it is an important export contract and supports its strategy to grow international markets and export business.
The aircraft will be built in the UK and will help to sustain 6,000 high technology and engineering jobs across sites in in Brough and Warton and Samlesbury in Lancashire.
Aircraft manufacture will begin in 2014 with delivery expected in 2017.