Do I need to send my airline a letter saying I'm going to travel with my ResMed CPAP machine?

It depends on the airline you are travelling with.

It can be difficult to know whether or not you need to send a letter to your airline before travelling with your CPAP machine.

The answer to this question is that it depends on the airline that you are travelling with.

It is highly recommended that you contact your airline at least 2 weeks prior to your flight departure. It may also be a good idea to talk directly to the Medical Services Department of the airline so they can give you the all clear for in-flight use of your CPAP machine.

Furthermore, they will also be able to advise you if a letter is required from your doctor or not.

If you planning on using your machine during your flight then you should try to pick a seat that has access to power. When you are on the flight remember to turn the humidifier off and switch your CPAP machine to airplane mode.

Keep in mind that if you are planning on travelling internationally then you may need a power adapter to power your machine as the plug type may differ.