Financiers and lessors who make the global air travel industry tick gather for an annual meeting in Dublin on Monday, buoyed by strong lease rates and relatively stable oil prices but facing uncertainty over jet shortages and trade tensions. Ireland is home to the worldwide aircraft leasing industry, which controls about half the world’s airline fleet, and the Airline Economics gathering provides an early chance each year to monitor economic and trade risks around the globe. For now, that means good profits for lessors and many airlines, since shortages push up demand and fares.