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Complete nonsense spotter. "Parish Pump Politics" is right. When did anyone in SNN have the power to tell those in DUB what to do with their runways. There may have been many factors but I doubt very very much that this was one of them.
I'm afraid its true I heard it from a former Aer Rianta manager who worked both Dublin+Shannon,Dublin had applied for a longer runway but was denied by the Government mainly due to pressure from the Shannon region at that time.