Does anyone have any theories on this? I have been reading more and more about these incidents lately....I have never heard of it happening before the 1990s....Has anyone else?

www.unknowncountry.com...

Here's another ice chunk story from CNN:

www.cnn.com...

Instead of starting another thread, here's what I've found:

This link will take you to the Faa's explanation of what "blue ice" is. It sounds reasonable, but there are still doubts.

This is another article I found from 2003.

There are more current articles out there on this that I've read today. If anyone wants me to post more info that I have found, just say so!!