I know this is a long shot,however, my mom is on dialysis. She does peritoneal dialysis, which consists of a night time cycling device. She has just told me it is larger than a normal carry-on when packed in it's carrying case. Therefore, it will probably not fit in an overhead compartment on the plane. Has anyone experienced taking medical equipment on the plane? I have researched this on the TSA site but it is very vague. Her supplies can be shipped down by the dialysis supplier but the machine itself will not be. I also plan to let WDW know that we will be expecting a package of medical supplies. I will also obtain a letter from her Dr.