I just received my QC15's last week and they came with the two prong adapter. I'm excited to try them out on the upcoming redeye flights I'm on. Now I just need to find those eye masks I've collected from DL over the years. For some reason I always end up sitting next to someone who wants to keep their reading light on while the rest of us are trying to sleep at 1:00 am. Maybe I'll just offer the pilots $20 to pull the circuit breaker on the reading lights...problem solved.