scheduled rights between Berlin and Saarbrücken was outside the CAB's regulatory scope as the route did not touch the US or its dependent territories, Pan Am began a major lobbying campaign in Washington, D.C. that aimed to thwart any future attempts by Modern Air and other US supplementals to apply to the CAB for permanent scheduled service authority. Pan Am's opposition to Modern Air's Tegel–Saarbrücken scheduled service application focused on the US supplemental's alleged lack of scheduled service experience, limited operational experience in the West Berlin air corridors and insufficient spare capacity (in terms of both aircraft and personnel) to cope with unforeseen disruptions. Pan Am claimed that this could result in an unreliable service and potentially endanger passengers' safety. It also warned that having to compete with Modern Air in addition to government-owned and -subsidised BEA and Air France in West Berlin's crowded scheduled air market could threaten the IGS routes' viability and force it to shut down its operations in Berlin. A single 12-seater HFB 320 Hansa Jet was acquired in 1970 as an air taxi to serve destinations not accessible by scheduled flights from West Berlin at the time. The arrival of Modern Air's Hansa Jet at its Tegel base marked the first appearance of a German-built aircraft at the airport since the end of World War II. Having overcome Pan Am's opposition, Modern Air eventually launched thrice-daily Tegel–Saarbrücken flights with its 12-seater Hansa Jet in May 1971, marking the airline's scheduled debut. As a result of the Hansa Jet's poor economics in scheduled airline service and a steady increase in passenger loads, Modern Air applied to the Allied Air Attachés for permission to operate two daily rotations with larger CV-990s. However, the Allied Air Attachés refused this under pressure from both Pan Am and BEA, West Berlin's leading contemporary scheduled airlines. Having had its application to introduce larger equipment on this route turned down, Modern Air withdrew all Tegel–Saarbrücken flights in November 1971. Pan Am's takeover of Modern Air's Saarbrücken route in February 1972, which entailed serving it from the former's base at the rival Tempelhof Airport with 128-seat Boeing 727-100s, was followed by the airline's unexpected suspension of Tempelhof–Saarbrücken services after less than a year's operation, citing insufficient demand. This turn of events resulted in Modern Air applying for permission to re-enter the Berlin–Saarbrücken scheduled market with two daily return flights using CV-990s. Permission for