Several, I'm sure. There's the simple Airplane Mode Widget for one. Then there's the way more complicated, but way more powerful Tasker for another (since it's capable of creating widgets to execute any of the tasks you define).
Oh, wait, the title said widget, but the question says status bar. On my S3 (also on 4.1.1), I can pull down the notifications, slide the power switches to the left a little bit, and there's the switch for Airplane mode. Does that work on yours?
If you haven't got the Airplane mode switch in your status bar, then the easiest solution would probably be SwipePad with a shortcut (not widget) to toggle Airplane Mode. This is the combination I use to turn on my LED flashlight (with TeslaLED). The reason you want a shortcut instead of a widget is because it saves you steps. If Airplane Mode Switch does indeed use a shortcut instead of a widget, then you're golden without having spent a dime. If it doesn't, then you can still buy the WidgetPad add on for SwipePad and use a widget, or buy Tasker and use it to create a shortcut which toggles airplane mode.