Be sure to look at the David Clark One-X. I kept coming back to their booth last year, and on the last day bought one--and I do love it. I have added a Flitelite Mic light to the boom mic and a hanger D-ring to the top. It is very comfortable for long flights, active noise cancelling is excellent, music sounds really good, and the Bluetooth has worked flawlessly, paired to my iPad Mini 4. It also has very good passive noise cancelling--there have been several occasions in which I've taken off without turning it on, and it's as good as most passive-only headsets. I've been a DC fan ever since I bought my first one in 1978, but to make them comfortable, Oregon Aero comfort items have been necessary (and they do the job well). But the One-X is already as comfortable as any of my modified DCs (I have 3 others). The only OA addition I've put on it is their SoftSkin ear seal covers, which cut down sweating in the summer and make the headset feel warmer in the winter. Supposedly the ANR works better without those, but I can't say one way or the other.
Cary