Former GPA executive Domhnal Slattery (52) made €32m when he sold aircraft leasing company Avolon to Chinese firm Bohai for €1.2bn in 2015. He is still leading the firm and it has been a busy year, with a mammoth €10bn order for 100 Airbus jets going in December. But there has been uncertainty too, stemming from the debt concerns around HNA, the giant parent of Bohai. Last year, Orix Corporation bought 30pc of Avolon through the Japanese group's Dublin-based aviation subsidiary for $2.2bn (€1.93bn), implying an Avolon enterprise value of $23.7bn (€20.8bn). Now based in Hong Kong, where he still leads Avolon, Slattery made his first big splash when he sold his first aviation business, International Aviation Management, to RBS for €45m in 2001. Slattery owns a swanky Shrewsbury Road house previously owned by developer Sean Dunne and his wife, Gayle Killilea.