Seat cushion, and seat apparatus provided with such a seat cushion

A seat cushion, in particular for an aircraft seat, provided with: a first foam body (2); a second foam body (3) extending below the first foam body (2); detachable connecting means (7, 8) to connect the first foam body (2) to the second foam body (3); wherein the first foam body is provided with a covering (5) which is fixedly connected to this first foam body (2).