I got a couple of these for my cars, and I thought they might work well in the plane.
www.amazon.com/Otium-3-Socket-Cigarette-Splitter-Detector/dp/B07169DMHM
As a bonus, the plug includes a digital voltmeter, which is useful for monitoring your battery and charging system. There are also a couple of self-stick pads on the bottom for securing it somewhere.
Disclaimer: I haven't tried one in the plane so I don't know if the USB ports will cause radio noise. YMMV
www.amazon.com/Otium-3-Socket-Cigarette-Splitter-Detector/dp/B07169DMHM
As a bonus, the plug includes a digital voltmeter, which is useful for monitoring your battery and charging system. There are also a couple of self-stick pads on the bottom for securing it somewhere.
Disclaimer: I haven't tried one in the plane so I don't know if the USB ports will cause radio noise. YMMV