Is the Everyfit approved for use on an airplane in booster mode?
No — when used without the internal harness system (in booster mode), this restraint is NOT certified for aircraft use. A belt-positioning booster requires a lap/shoulder belt system, which is not available in aircraft. With the internal harness, it is certified for aircraft use. (Page 19)
From the official Evenflo Everyfit Car Seat manual, page 19
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