I have a pair of UE11Pros (LOVE THEM, by the way -- best 'phones I've ever listened to), and yes, they do have removable / replaceable cables. In fact, the standard cable that comes with these IEMs is perfectly long enough to comfortably go from your head (ears) to your waist (belt pack receiver). With the cable coming from around your back, it's a bit short to let you hold your music player out in front of you...make sure to get the longer cable if you want to put your music player a bit further from your body (like, say, in the seat back pocket).

Just check their website -- it's got all the information you need.

Travel safe!