A second weekly frequency is being added by Lufthansa between Shannon and Frankfurt.
The extra summer seasonal service will run on Thursdays between May 2 and October 12.
An Embraer 190 regional jet will be deployed on the route to supplement an Airbus A319 service on Saturdays which has been operating for two years.
Lufthansa UK, Ireland and Iceland senior sales director Andreas Koester said: “Testament to the demand for our services in this important market, we are delighted to be able to double our capacity on the Shannon-Frankfurt route.
“This additional capacity enables us to offer even greater options for onward outbound connections through Europe and long-haul destinations to Asia, Sao Paulo and Johannesburg, with the inbound flight offering a more seamless journey from the North Atlantic.”
The Irish west coast airport’s managing director Andrew Murphy added: “This is very positive news for us as it reaffirms the market that there is for Shannon for services into European hub airports.
“Lufthansa would not be doubling frequency unless the demand was there.
“Having Lufthansa commit with this second weekly service across the summer season is very encouraging from that perspective.
“In addition to the outbound opportunities for onward connections and, indeed, the opportunity this gives eastern markets to fly with one-stop connectivity into Shannon, the German market is the third largest tourism market for Ireland.
“As the gateway airport to the Wild Atlantic Way, we offer direct access for that market to the part of the country that resonates the most with them.”