Thank you for your question.
Generally the connection on an airplane will be a standard 3.5 mm audio connection where an adapter is not needed to connect the headphones. Sometimes you will find a dual 3.5 mm connection on the airplane in which case an adapter would be required to connect the headphones. This adapter is available from our Product and Technical Support group who can be reached at 1-800-711-5772. The hours of availability are 8:30AM - 10:00PM M-F, Sat 9 - 7:00 EST.