Ireland is where an unusual share of the world's pharmaceuticals and medical devices are actually made, and both industries generate exactly the traffic hand carry serves. From Cork it is active ingredients, biologics, qualification samples and reference standards moving against batch release dates. From Galway it is implants, instrument sets and loan kits moving against surgical dates, which are fixed points rather than delivery windows.
The second driver is corporate. A very large number of American companies run their European operations from Dublin, which produces a constant flow of executed originals, board documents and regulatory filings in both directions, on deadlines set by lawyers and regulators.
The operational quirk of this lane is preclearance. Because passengers departing Dublin and Shannon for the United States clear US immigration and customs before boarding, an inbound courier arrives in America as a domestic passenger. That is genuinely useful, it removes an arrival queue at a US hub, but it also moves the formalities to the Irish end, where they have to be right before the aircraft leaves rather than after it lands.


