Of course, a portable dialysis machine is permitted to be carried, and at no charge when carried by itself or with other assistive devices, medications and/or medical supplies. Portable dialysis machines do not count towards your carry-on baggage allowance and may be carried on-board or transported as checked baggage. We encourage our customers with special needs to carry on-board any assistive devices or medications that are medically necessary. While we allow portable dialysis machines to be transported, they may not be used while onboard our aircraft. To safely be stowed on-board, the device must not exceed 22 x 18 x10 inches (56 x 46 x 25 cm). Spirit’s aircraft are not equipped with electrical plugs for use with any electronic device.