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I travel regularly in Europe and do not need to use my CPAP machine whilst on board a plane, but was advised that it should NOT be placed in the hold.
The usual reason for that advice is to make sure that the CPAP machine ends up at the same place that you do at the same time, rather than in some other place because the checked baggage got misrouted.
Apart from that, if the machine is well packed there is no specific technical/medical reason why a CPAP machine can't go in checked luggage, in the hold.
We need to recognise that we are not presently "in the normal course of events" and that many travellers are going to be inconvenienced to a greater or lesser degree.
BTW, if you look at the fine print on most of the medical equipment exceptions for air travel, you find that it the equipment is indeed needed for immediate life support there are many, many restrictions and additional requirements/documentation/insurance associated with its use on an aircraft.
The use of CPAP machines on commercial aircraft carries a relatively light documentation load (in the case of BA is carries none) and is always on a best effort basis. The airline usually warns that they cannot guarantee that you will actually be able to use one (due to power availability or other operational issues).
Trying to claim that CPAP is essential life support medical equipment is usually just counter productive, as the airline starts to look at that other set of requirements and (trust me on this) you really don't want to go there!
Cheers,
Bill