I use these headphones on airplanes, in the airports, and at work. They really cut down on the extra noise. The first time I wore them on a flight, I decided to take them off because it didn't seem that noisy on the plane. I immediately put them back on. I was amazed at how much quieter it was with them on.
[5 of 5 Stars!] 
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Sunpentown SU-4010 Dual Mist Humidifier with ION Exchange Filter 
AKG K 240 MK II Professional Semi-Open Stereo Headphones with FiiO Q1 Mark II Portable Headphone Amplifier & DAC