AOTW - yes they are available, they are very small and easy to lose. A 2 into one socket. Some of the old Skywest aircraft you'll hear in your part of the world have the single plug com system, and they can be used to plug into them with new DC's.
I use a pair of DCs no idea what type, and often on long trips I will use ear plugs too. Already have a hearing loss, not planning on making it worse.