Puro Sound Labs are great - 2yo DD has the Junior Jams. They are also decibel restricted but are noise cancelling and plenty loud enough for an aircraft. I know because I have a tiny head and used them when she was asleep
Any recommendations? He is 6 and has a pair of Mr Men ones, I thought they were just quiet / for toddlers, but all the kids headphones seem to be restricted at 85db and his old ones definitely aren't loud enough on a plane.
We have a long trip to Canada so need to get this right!