This is the first trip via air I have taken without my Bose noise-canceling headphones since I picked them up on my way to Bermuda a couple of years ago. In my rush to get out the door Sunday morning, they did not end up in my bag. I used EarThumps--which I usually use in conjunction with my iPod--to watch my portable DVD player instead on yesterday's flights, and didn't really notice the absence of the QC2s. Today, however, on the segment from Nashville back to Detroit, I was more aware of the rumble of the jet, perhaps because I was seated further back in the plane. I'll be sure to pack the Bose headphones for my flight to Las Vegas on the 26th.