Night flight - I recently bought and installed an ANR upgrade kit to fit in my DC 10-13.4 headset and it works really well. There's a couple of models available over the internet for around $250 and if you can overcome the fear of pulling a perfectly good head set apart it was well worth the investment. The brand I used has an agent on the Sunshine Coast so you don't have to wait weeks to get it from the states. I can give you more details in a PM if you like.