Robert M. Gary writes:

I usually do. Many of the rental planes keep a bottle in the back too.
I have a large bottle I bring for the family 4 place, but also a
smaller, more manageble bottle with just one port for myself in the
Mooney.

Is this just a device you set down on the seat beside you, or what?
How long does one bottle last? I presume it's automatically regulated
so that you use only as much oxygen as you need for the altitude?

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