Aer Arann are used often for RaboDirect Pro matches plus RBS Six Nations Matches to/from Cardiff.
On Friday just gone Aer Arann was used to take the Ireland team to Edinburgh. Also the same night Connacht rugby chartered Aer Arann to operate their flight to Shannon/Cork.
During the Wales V Ireland weekend there were both Aer Arann charters and Aer Lingus Regional additional flights.
It seems to me that all charters have to be operated under their own brand however Aer Lingus Regional can be used for additional scheduled flights for capacity reasons