On a recent flight in the first class cabin, I sat in a window seat. The person seated next to me in the aisle seat was a nice guy and we had just enough conversation that it was not overbearing or annoying. He mentioned to me that he did not understand why aircraft manufacturers went out of their way to provide windows when it would be so much more cost effective not to do so. Just put solid sheets of material instead of cutting out openings — and there would probably be fuel savings as well. Well, do they not already have aircraft similar to that known to haul cargo? I did not like that idea. I like looking out of windows. Does anyone else share the philosophy of the potential benefits of windowless aircraft espoused by my seatmate?