A new £2m contract creating 100 jobs has been awarded at George Best Belfast City Airport.
G4S, which is a major employer in Northern Ireland with 1,500 employees, will carry out duties including searching, customer assistance and car park management over the next three years.
George Best Belfast City Airport currently caters for approximately 2.7 million passengers per year representing almost 40% of the scheduled domestic air traffic to and from Northern Ireland.
G4S has extensive global aviation expertise developed through the provision of services to 61 airports and for 81 airlines across 34 countries.
G4S provides services to 16 airports and 21 airlines in the UK, including Northern Ireland's City of Derry Airport.
Mark Beattie, operations director at Belfast City Airport said that the decision was based on an overall package that offered value for money and quality of service.
"We are also very pleased that the employees who are currently based at Belfast City Airport with our previous security provider will remain at the airport under G4S," he said.
"As a globally well-established security company, we feel confident G4S will take good care of the interests of Belfast City Airport and the security of our passengers in the best way possible."
Meanwhile, new Flybe services from the airport to Bristol, East Midlands and Liverpool begin on Sunday, bringing the total number of routes offered by the airline from Belfast to 17.