Just a point about the QC15/UFlyMike combination. I used it and it was marvellous (awesome is an apt description!), but the boom only swings forward on the left side which is a little more constraining for right hand seat use, but it is still superb nevertheless. Very lightweight and without bulk. Definitely not good for one ear off, intercom is a must. I was using for several years before that a Telex 850 ANR. Useful, and far nicer than the standard passive set, but the noise attenuation is very limited by the small size of the earphones, and one ear off hardly worth bothering. For 737, you need 2 plug use- my UFlyMike had a single plug, the Y-adapter was about £50. Beware the large Bose and Zulu cans, they are significantly heavier and must be a pain to keep in a briefcase. The QC15 comes in a useful and small case which will also hold the UFlyMike, and as they say in the colonies, 'really kicks ass'!