New figures from the Central Statistics Office show "an unprecedented collapse" in overseas travel to and from Ireland in April as the effects of the Covid-19 crisis deepened.
The CSO reported just 16,100 arrivals in April and 17,800 departures.
This compares with monthly travel of more than 1.7 million in each direction the same time last year - an annual fall of 99%.
Today's figures show that of the 16,100 people arriving in Ireland, 75.2% arrived by air and 24.8% arrived by sea.
Of the 17,800 people departing Ireland, 72.2% departed by air and 27.8% left by sea.
The figures are contained in the CSO's new monthly release on Air and Sea Travel Statistics.
The statistics have been introduced to provide data on passenger numbers, in the absence of the CSO's monthly tourism surveys.
The CSO suspended the collection of the tourism surveys at air and sea ports in March, because of the Covid-19 situation.
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Today's figures are based on information provided by the airports and sea ferry operators themselves.