Originally Posted by
tentseller
IIRC
You are allow to use a FAA approved CPAP by the DA. This include all US flagged carriers. I carried a copy of my Resmed 9's FAA certificate and bring my own power. The airline is not obligated to provide power.
JAL and CX are not covered by FAA nor DA unless the origin and destination are US airports.
However in general most countries aviation bodies recognize FAA/EASA certification for purposes of allowing equipment to be used. For example most seat belts are simply certified to meet FAA standard, regardless of the country/airline. However it's still legal to use them since the countries recognize the FAA standard.