14 CFR 91.523 Carry-on baggage
Subpart F—Large and Turbine-Powered Multiengine Airplanes and Fractional Ownership Program Aircraft
A reference copy of the official regulation text for study. It is not legal advice or an FAA interpretation; always confirm against the current official source.
No pilot in command of an airplane having a seating capacity of more than 19 passengers may permit a passenger to stow baggage aboard that airplane except—
(a) In a suitable baggage or cargo storage compartment, or as provided in § 91.525; or
(b) Under a passenger seat in such a way that it will not slide forward under crash impacts severe enough to induce the ultimate inertia forces specified in § 25.561(b)(3) of this chapter, or the requirements of the regulations under which the airplane was type certificated. Restraining devices must also limit sideward motion of under-seat baggage and be designed to withstand crash impacts severe enough to induce sideward forces specified in § 25.561(b)(3) of this chapter.