This is not a "I'm stranded" type query so I did not include in the consolidated thread.

It is not unprecedented for ash clouds like this to last for weeks and even months. Fortunately most have been over poles, not heavy airspace. What are DL's options for resuming some level of ops if the cloud continues for a very long time? Can they re-route south? Go into Madrid/Rome and increase low altitude shuttles into EU? I'm assuming there is no even remotely easy way to mod planes to be able to deal with it.