Copy your systemui.apk and rename apk to zip then extract then find every airplane icon and delete it!
Get back and put all the files and folders you extracted in zip file and choose store/none compressing mode then rename it to apk and set the same as old one name
Then sign it with zipsigner (get it in play store) and push it to the place you copied the systemui.apk and set rw-r-r
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