The City of Derry airport was forced to close at midnight because of safety concerns expressed by the UK's Civil Aviation Authority.
Ryanair has cancelled all flights to and from the airport from today and British Airways has diverted its services to Belfast.
The decision follows an inspection in which the authority identified problems such as poor runway drainage.
In a statement, management said it was committed to maintaining the highest safety standards.
Talks on the issue have been taking place today and are expected to continue tomorrow.
