Prior to the introduction of both clearance facilities the media ran stories which presented the initiatives as massive golden nuggets for Shannon. We were told that dozens of executive jets would be landing there every day to avail of the pre customs facility and that pre-immigration would create a hub for airlines from Central Europe and the former Soviet Republics. These would also be filtering hundreds of thousands of passengers every year through the wonderful facility at Shannon. None of this has happened primarily because of advances in technology which have allowed more and more business aircraft and airliners to fly long distances without stopping.
No airline or business jet is going to needlessly stop at Shannon just to avail of pre customs.