The City of Derry Airport reopened to all flights from midnight last night after regulatory officials approved new safety measures.
The airport was closed last Thursday night after officials from the UK Civil Aviation Authority identified problems such as poor runway drainage and the lack of an effective plan to deal with flocks of birds that might interfere with take-off and landings.
A British Airways flight to Dublin was the first departure from the airport in four days. Ryanair flights will resume tomorrow.
City of Derry Airport Manager Seamus Devine, who had defended the airport's safety record, said today that it was now completely safe.