 However, it was soon eclipsed by the arrival of more advanced business jets, such as Learjet’s Model 23, leading to the joint venture being disbanded during early 1961.During the 1960s more advanced variants were developed such as the "MS.760B Paris II" and the six-seat "MS.760C Paris III"; the latter would not enter production however.While four-seat propeller planes are commonplace, jet-powered aircraft with this seating arrangement, such as the Grumman EA-6B Prowler combat aircraft, have remained comparatively rare.