Under the part of the agreement with Swissair, Delta plans to no longer fly four direct flights a week to Zurich.
Passengers can still fly from Cincinnati to Zurich.
However, they will have to stop in New York, Atlanta or Paris before catching a connecting flight, Mr. Anderson said. Delta, which operates its second-largest hub at the airport, has forged an alliance with Air France and plans to increase the number of daily flights between Paris and Cincinnati from one to two. For instance, in the agreement with Sabena, Delta flies passengers from across the country to the Northern Kentucky airport, where they then board a direct Sabena flight to Brussels. Last month, Sabena said that because its relationship with Delta is ending, it will discontinue a daily direct flight between Cincinnati and Brussels on Sunday. Sabena has said it chose to terminate the relationship with Delta to concentrate on its agreement with American Airlines.