Airbus has announced a new order for 100 aircraft which it said will help sustain 9,000 jobs.
The contract with AirAsia, the biggest low-cost airline in Asia, will safeguard 1,500 jobs at Airbus and a further 7,500 in the supply chain.
Prime Minister David Cameron joined the airline's founder during a visit to the Airbus factory in Broughton, North Wales, where the order was announced.
The contract covers 64 of the A320neo aircraft and 36 of the A320ceo version, with all the wings being made at the Broughton plant.
Mr Cameron said: "This is excellent news and a tremendous boost for the workforce and for UK manufacturing. Today's announcement demonstrates the strength of the UK aerospace sector and the important role it plays in growing and rebalancing our economy.
"This Government will continue to back UK aerospace; cutting business taxes, investing in exports and working in partnership with the industry to ensure it is fully equipped to compete and thrive in the global race."
Tan Sri Dr Tony Fernandes, chief executive of AirAsia, said: "This order will meet our additional short and medium-term growth requirements as we see demand continue to rise across our network. The A320 has played a key role in our success, enabling us to offer our passengers the lowest fares possible and completely redefine short-haul travel in Asia."
Tom Williams, senior UK representative for Airbus, said: "This order comes as a huge boost for the teams in Broughton.
"We must not underestimate the importance of aerospace engineering and manufacturing in the UK which is highly skilled and high-value work, as demonstrated by the important role we play in providing a significant contribution to Airbus commercial airliners."
More than 8,800 A320 aircraft have been ordered and over 5,300 delivered to some 380 customers and operators worldwide.