Interesting...I was on board LH 438 last Saturday from FRA to DFW and we directly overflew Iceland while en route. I was aware there had been some earlier concerns with regard to a possible volcanic eruption so I was a bit surprised by the routing. The flight crew made no announcement concerning our route of travel and, of course, I was seated in a window seat on the wrong side of the aircraft and so did not notice any volcanic activity....but this may have been before the current eruption.