From a member of our community:
We want to take basically one more trip somewhere as we are getting older and require more Doctors. I have an Inogen portable oxygen machine I carry on my shoulder. The battery is good for 4 hours unless I can get to 12V or 110V. Do you know if commercial airlines offer either so that I can extend the battery to fly farther? If so, are connections normally close to seats or do you have to ask for such seats?