According to Reuters, about half of the world’s _leased_ aircraft are managed from Ireland:
With a skill set that runs from seizing planes from bankrupt third-world airlines to negotiating multibillion-dollar deals with Airbus (EAD.PA) and Boeing (BA.N), a few dozen former colleagues from now defunct GPA have ensured that one in every five of the world’s passenger planes is managed from Ireland. That equates to about half of the world’s 7,000 leased aircraft.
But they are only about one fifth of the total fleet.
