Just go to Radio Shack for adaptors...
I use Bang & Olufsens...over the ear, but the ear pieces swing out for comfort and for when you need to hear. The hangers slide and swivel for a perfect fit, and hold the foam in nicely to block out sound pretty well without shoving anything into the ear canal. A bit pricey, but well worth it for long periods. Around the house or on planes, I use the Bose sound killers.
link to B&O Earphones