I've often wondered why I get so tired after a coast-to-coast flight. After just sitting there, motionless for hours, I usually feel like I've run a marathon. Studies have shown that a constant low-frequency noise will introduce fatigue. When I received the Solitude Headphones ($200) from a company called Plane Quiet, I hoped maybe my days of feeling worn out after sitting inside a pressurized tin can for a half a day might be over. Beyond that, I wanted to hear some tight music through a pair of good-sounding headphones. These Solitude phones did not disappoint on either count.