Gee Jenna,
I never thought of it that way.....I see your point! Hmmmm

Other than to say......if possible, try to time it to where you would'nt have to charge up in a setting such as that......
Is there a way you could run your unit's 'amplitude' down a bit lower on that day or during the flight, so your battery wouldn't need charged up as usual....maybe it could buy you a bit more time until you got into a more private setting to where you wouldn't have to feel so inhibited?
I certainly understand, especially with these times we live in.......

I wear baggy clothes alot these days........for comfort.....but more than that...I've been wearing a lumbar belt around my painful lower back and don't want to 'advertise' it ...... also don't like the feeling of it next to my skin, so I put it on OVER a t-shirt and then I wear an oversized hoody-type thing that I zip up halfway, so it hides the belt.
Perhaps you could wear such a hoody or something similar......it has big pockets and that's where I stuff my SCS charger in if I'm up and about while charging.

Otherwise, I just do my best to make the atmosphere as 'light' as possible to the people around me - either by joking about my 'bionic buzzer'.......but if the 'humor tactic' isn't appropriate in certain situations, then just come right out and explain it point blank to whomever it may concern....... In the airplane setting, maybe just mention it to the flight attendent and see what she has to say about it.....so that the people in your area are aware of what's going on....
I'm sure they get passengers with certain similar needs all the time......

I wonder how they handle passengers who have to carry oxygen tanks? Or if that is even allowed on planes??

This is a good point you bring up!
Rae