According to MOL on the radio this evening, Ryanair is Europe's largest airline and it needs H6 to accommodate 5 or 6 737's in heavy maintenance at a time in the winter period. I think that Ryanair, Aer Lingus and the Govt can gain from a solution to this. Hand over H6 to Ryanair, Aer Lingus make a profit being bought out of the lease and have ample time to build another large hangar at Dublin (for which they don't need to use until 8 years time).
The Govt gains by having 300 more taxpayers, 300 less struggling families on the dole and the maintenance of this high tech skillset in Ireland.
Aer Lingus is after all majority owned by the Irish taxpayer and Ryanair.