United continued to expand furiously in Europe following the Summer takeover of Pan Am's Heathrow routes. Amsterdam, Brussels, Berlin, Hamburg, and Milan would be added. Some of these routes were paired back as United partnered with Lufthansa. In late 1991, United purchased all of defunct Pan Am's Latin American routes. The DC-8-71s were retired in this year. The DC-8 served with United for 32 years.