Abstract: Occupant restraint systems for use in aircraft and other vehicles are described herein. In some embodiments, the occupant restraint systems include an under-seat airbag positioned below a seat cushion having a separation feature extending laterally therethrough. The separation feature enables a front cushion portion to move upwardly and away from a seat pan by a greater distance than a rear cushion portion upon inflation of the under-seat airbag, thereby favorably positioning the seat occupant's thighs relative to the seat occupant's torso.