When she said her son loved airplanes, I couldn't resist making one extra block at 9.5". Hopefully you can find room for it on the back or maybe you could use strips to make it larger and use it as a pillow on his bed? Or if it doesn't work at all, just hang on to it until you find a use for it. I used a bit of extra fabric I had around in my stash for this one and tiny bit of your red. I hope you don't mind. I couldn't resist. Tutorial now available.