Large numbers of flights into Cork had to be diverted to other airports this week after a faulty landing system was shut down by safety authorities.
Yesterday 17 flights had to be diverted to Dublin, Shannon and Kerry Airports as planes were unable to land at Cork.
Officials said it could take up to a week to rectify the problem and test the system.
Instrument Landing System (ILS) uses radio signals to guide planes into land in fog or low cloud.
Over the past week there have been intermittent problems with the ILS system for Runway 17, which is used by planes approaching the airport from the north flying over the city.
This runway is used when there are southerly winds as it is preferable to land into the wind. However when there is a combination of southerly winds and poor visibility, as there was yesterday, it resulted in all flights being diverted to other airports over a seven-hour period.
17 Aer Lingus, Ryanair, Jet2.com and Monarch flights from various locations including London, Paris, Pisa, Faro and Glasgow had to be diverted to Dublin, Shannon and Kerry. It was not until after midnight that normal flights could resume.
The ILS systems on Runway 35, for flights coming in from the south over Ballygarvan, and the ILS system on the smaller runway which crosses the main runway are not affected and are working normally.
As a result of the fault the Irish Aviation Authority (IAA) have shut down the ILS system on Runway 17.
Teams from the IAA are working with the ILS manufacturer in Cork Airport trying to find out what the fault is, rectify it and fully test the equipment. As a result it could take up to a week before the system is fully operational again.
A spokesperson for the IAA told the Evening Echo that their primary concern was the safety of all passengers which is why some diversions were necessary.
Passengers and those expecting passengers to arrive over the next few days are asked to check with their airlines on status of flights.

Link to IAA’s notice