The CPAP must have its own power source such as a battery. You cannot use the in-seat power outlet for your device. What if the outlet doesn't work? Here is a quote from
their website:
Portable electronic personal ventilators, respirators, and continuous positive airway pressure (CPAP) and BiPAP machines may be carried and used on board JetBlue, in accordance with specific FAA guidelines.
Please note some of our aircraft have in-seat electrical power, but it is not available for ventilators, respirators, BiPAP or CPAP machines.
Ventilators, respirators and CPAP machines are considered
assistive devices. They must be stowed and used in the cabin consistent with applicable TSA, FAA and other regulations governing carry-on bags.
If you are using a POC, you cannot sit in a bulkhead or exit row, and you must be in a window seat. I imagine the requirement for a CPAP device is similar. You may want to call JetBlue for more specific information.
-J.