Share this article Unusual plane activity on the south coast of Ireland had people "mystified" this week, with the peculiar route of one aircraft raising myriad theories of what it could be up to. Listeners to The Pat Kenny Show this week reported the sighting, and were perplexed as to why the plane was travelling back and forth in regimented lines. The main reason attributed to the plane flying in that pattern was some sort of radar exercise, but people couldn't fully explain it. Speaking to Pat on Thursday, Kevin Byrne, retired Lieutenant Colonel and Airport Safety and Security Auditor at Cemax Consultants, said he was initially "mystified" by the activity.