NC does work.
As far as the AirFly, I've been using one with APP1/2 for roughly the last four years thanks to Delta. Good luck watching in-flight entertainment on your own device with Delta, and there were times that I didn't feel compelled to take my Plantronics Backbeat Pros with me (they have analog line-in built in when you don't have BT option). Short answer, order the AF Pro and run with it. The SE will suffice as well, it's like the older AF that I still use, but the Pro is just a few more clams and if you ever want/need to share the audio and/or use it as a BT input for an older device, it's nice to have it all available in one swoop.
One nice feature is that the batter life is much longer on the new versions, so you will be good to go from takeoff to landing without having to recharge. Your APP2 are another story... Bottom line, it works well and if you are bound to antiquated media setup on your flight, all good. If you can get the media via wifi and have an iPad on hand, a larger screen is a perk...
The only thing I don't like about the new AF is that the cable is permanently affixed, so keep your pets, scissors, whatever could damage that cable far away. On my older version the cable is detachable (3.5mm plug).