Colm Barrington likes to joke that he has three words for anybody looking to sell a company: call Goldman Sachs. And that was who the Irish aviation veteran called in 2020 when a decision was taken to sell Fly Leasing, the Irish-based aviation leasing business that he had led for 13 years. Small by the standards of other Dublin-based leasing behemoths AerCap and Avolon, Fly Leasing had been trading at a significant deficit to its net book value while it was selling assets at a 20 per cent premia to net book value. Investors were just struggling to understand the…