 This sale also enabled Pan Am to address fleet incompatibility issues related to the earlier acquisition of National Airlines as it included Pan Am's Pratt & Whitney JT9D-powered 747SPs, its Rolls-Royce RB211-powered L-1011-500s and the General Electric CF6-powered DC-10s inherited from National, which were transferred to United along with the Pacific routes.In the early 1980s, Pan Am contracted several regional airlines (Air Atlanta, Emerald Air, Empire Airlines, Presidential Airways and Republic Airlines) to operate feeder flights under the "Pan Am Express" branding.The acquisition of Pennsylvania-based commuter airline Ransome Airlines for $65 million (which was finalized in 1987) was meant to address the issue of providing additional feed for Pan Am's mainline services at its hubs in New York, Los Angeles and Miami in the United States, and Berlin in Germany.