Grounding aircraft a good idea! I've heard it all. An expensive non performing asset. It makes no sense unless you have to do it, i.e buying too many aircraft and are fire fighting to keep the head above water.
1/2 billion doesn't sound like fighting to keep the head above water....could be wrong though.
Using assets to make money is sensible, using them to loose even more money doesn't.
Easyjet didn't ground any aircraft and listening to posters they supposedly had a great winter and lost £112M where as Ryanair grounded aircraft and lost 30% of that.
There is a mother of all recessions out there that is going to last another couple of years hence why kill the company when its not necessary.