I think people will find somewhat more balanced background on the CBP at this link:
http://www.irishtimes.com/news/new-a....831598?via=mr
Essentially, these are inter-governmental agreements. The arrangement at Shannon was no so much a local management initiative (some folk like to ascribe every good thing at Shannon to local management, and every bad thing to nefarious forces frustrating local management), as central Government negotiating something to placate the Shannon Airport lobby for the loss of the compulsory stopover requirement which had forced all trans-Atlantic services bound for Ireland to stop at the airport, previously relaxed to a requirement to stop for at least one leg. The stopover was an obstacle to the development of trans-Atlantic services; however political requirements required some gesture to mark its passing.
What do you need to get such a facility? Basically, a motivated Government with an effective diplomatic service.