Knock Ireland West Airport (IATA: NOC) is an airport located 3 NM (5.6 km; 3.5 mi) south-west of Charlestown, County Mayo, Ireland. 630,000 passengers used the airport in 2008.The airport was formerly known as Knock International Airport, Connacht Regional Airport, and Horan International Airport. Connaught Aero Club and Shoreline Aviation are based at the airport.
The airport was officially opened on 30 May 1986, however the first commercial flights operated seven months earlier on 25 October 1985 in the form of three Aer Lingus charter flights to Rome.
Here are some of the major Airlines that service Knock Airport:
The above mentioned information is taken from: http://en.wikipedia.org/wiki/Knock_Airport