Not to give airlines any ideas, but....
https://www.google.com/search?q=sta...&hl=en&client=safari#hl=en&q=cattle+stanchion
Of course the passengers could always "stand up, hook up, shuffle to the door"
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Not to give airlines any ideas, but....
https://www.google.com/search?q=sta...&hl=en&client=safari#hl=en&q=cattle+stanchion