Headphone Suggestion
 

I am just curious for those who travel, I am looking for a good pair of noise canceling headphones to use on the plane for under $40.00. I had a great pair of Sony headphones that I got for $24.00 however they broke and I can't seem to find that same pair anywhere.

I use Sennheiser's HD448 while traveling. That's a great headphone. It's €80,- though. ($109,-)

Otherwise you can also check these out:

Sennheiser UK Ltd - Online Shop - HD 418
Sennheiser UK Ltd - Online Shop - HD 428
Sennheiser UK Ltd - Online Shop - HD 438

The price is a bit more than what you asked for, but I can guarantee Sennheiser is an extremely good brand. They currently are the creator of the best headphone in the world. Even Sony hasn't reached that level.

Spot on, saw this on our local newspaper this morning while on the subway to work

Sport Earphones, Developed by Athletes for Athletes, Never Fall Out | Yurbuds