Because the noise generated from the engines and turbulence actually affect the sound on the movie. Another product that I absolutely love. Mic is clear, but produces a slight echo. It was hard and came in two pieces. I probably get those if I were going to upgrade. I let my mom try and she had the same problem. It would have been more functional if that turned on an off when the mite is turned on and off. Overall I recommend this product. I handed them out to students for their Chromebooks and out of 33 handed out, only 1 didnt work. Shame on Samsung for pushing this mediocre product.