aircraft as a medium/long range airliner. In 1977, US carrier Eastern Air Lines leased four A300s as an in-service trial. Frank Borman, ex-astronaut and the then CEO of the airline, was impressed that the A300 consumed 30% less fuel, even less than expected, than his fleet of L-1011s. Borman proceeded to order 23 A300s, becoming the first U.S. customer for the type. This order is often cited as the point at which Airbus came to be seen as a serious competitor to the large American aircraft-manufacturers Boeing and McDonnell Douglas. Aviation author John Bowen alleged that various concessions, such as loan guarantees from European governments and compensation payments, were a factor in the decision as well. The Eastern Air Lines breakthrough was shortly followed by an order from Pan Am. From then on, the A300 family sold well, eventually reaching a total of 561 delivered aircraft. In December 1977, Aerocondor Colombia became the first Airbus operator in Latin America, leasing one Airbus A300B4-2C, named Ciudad de Barranquilla. During the late 1970s, Airbus adopted a so-called 'Silk Road' strategy, targeting airlines in the Far East. As a result, The aircraft found particular favor with Asian airlines, being bought by Japan Air System, Korean Air, China Eastern Airlines, Thai Airways International, Singapore Airlines, Malaysia Airlines, Philippine Airlines, Garuda Indonesia, China Airlines, Pakistan International Airlines, Indian Airlines, Trans Australia Airlines and many others. As Asia did not have restrictions similar to the FAA 60-minutes rule for twin-engine airliners which existed at the time, Asian airlines used A300s for routes across the Bay of Bengal and South China Sea. In 1977, the A300B4 became the first ETOPS compliant aircraft, qualifying for Extended Twin Engine Operations over water, providing operators with more versatility in routing. In 1982 Garuda Indonesia became the first airline to fly the A300B4-200FF. By 1981, Airbus was growing rapidly, with over 400 aircraft sold to over forty airlines. In 1989, Chinese operator China Eastern Airlines received its first A300; by 2006, the airline operated around 18 A300s, making it the largest operator of both the A300 and the A310 at that time. On 31 May 2014, China Eastern officially retired the last A300-600 in its fleet, having begun drawing down the type in 2010. From 1997 to 2014, a single A300, designated A300 Zero-G, was operated by the European Space Agency (ESA), centre national d'études spatiales (CNES) and the German Aerospace