Via Patterico’s Pontifications, a man in Santa Cruz succeeded in getting damages at small claims court against American Airlines when he traced the plane that had dropped two large lumps what is euphemistically called blue ice (why blue?) onto the skylight of his boat.Answering my own question: there is a definition of blue ice in a February article in the Santa Cruz Sentinel. A dark blue chemical is added to the water to break down solid matter. The Federal Aviation Administration is said to claim that the ice would have melted before the waste hit the ground. Another article from the same paper shows a photo of a hole in a bedroom ceiling probably created by a block of blue ice.