 One downside was that the electrical relay contacts would get dirty and required constant cleaning.And although it did help solve the availability issues, this made the rest of the booking task - collecting passenger information and recording the sale - that much more of a problem that needed to be solved.Encouraged by the Reservisor, but ultimately unhappy with the advantages it offered, Amman started examining a much more advanced system that handled not only the availability issues, but the actual seat inventory as well.