Can I use this car seat on an airplane?
This restraint is certified for use in aircraft ONLY when used with the built-in harness. When used as a booster without the harness, this restraint is NOT certified for use in aircraft. Install it the same way as in an automobile with a lap belt and verify the airplane seat belt holds the car seat securely in place. (Page 32)
From the official Graco Car Seat Seatbelt manual, page 32
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