Abstract: The invention relates to a device allowing passengers provided with computer terminals and located on board an aircraft to use an electronic commerce website comprising in particular servers hosted by a computer infrastructure located on the ground and capable of being interrogated from the aircraft by way of a limited-bandwidth communication link between the aircraft and the ground infrastructure, wherein the electronic commerce website consists of a semi-embedded electronic commerce server (denoted “SeeS” for short) consisting of two parts, namely, on the one hand, a component located on the ground and, on the other hand, a component embedded in the aircraft and configured to optimize communication with said ground component depending on the various phases of a flight.