If you enjoy listening to music of watching movies while you travel, chances are that you have a couple splitters laying around the house. I have a couple in my carry on; theyâre small and they always come in handy. Use them to share the movies you are watching, or music you are listening to, with your traveling companion. Some airlines carry these to offer to passengers, but most donât. A little advance planning, and a small purchase, may allow you to save on inflight entertainment rent