Don't like Dr. Dre headphones, much better alternatives from other companies. I assume you're talking music wise, didn't know you could use them as a flying headset?
I use a Telex 850 ANR, does the job, lightweight no batteries needed. I was really impressed with the noise cancelling in the Bose QC15, really good. A20 is overkill if you ask me. I didn't get the QC15 because the mike can only attach to the left, bit awkward as I'm an FO and trying to keep one ear cup off is tricky. I also CBA with batteries.