AeroSur had used a 747 leased from Virgin Atlantic on that route but had returned it to the lessor. The airline planned to resume that route with an ex-Aerolíneas Argentinas 747-400. Ultimately, AeroSur struggled to keep its operations running smoothly and returned its 767 aircraft to the lessor. On May 17, 2012 AeroSur suspended all its flights again, and other airlines such as state-owned Boliviana de Aviación have since begun to fill the void left by AeroSur. The airline was in talks with potential US investor William Petty who signed a memorandum of understanding to invest up to US$15 million in the Bolivian carrier. AeroSur's air operator's certificate was revoked on July 20, 2012. A group of former employees, as well as William Petty, planned to create a new airline called TU Aerolínea, but, as of 2018, nothing had happened as far as that venture. Subsidiaries The airline had two subsidiaries: AeroSur Cargo AeroSur had freight transport service nationwide and international with direct shipments. AeroSur did not operate any dedicated cargo aircraft, but used the cargo holds of its passenger aircraft for network-wide freight transport. AeroSur Paraguay AeroSur Paraguay was a brand of its parent company which was trying to become a future airline based at the Silvio Pettirossi International Airport, in Asunción, Paraguay and to be a subsidiary of the Bolivian airline. Unfortunately, the brand could never be consolidated as one legitimate and legally operational airline, it only became the name for one of the Bolivian airline's aircraft that has already been withdrawn from its fleet due to the financial problems that afflict one of the most important private airlines in Bolivia in recent years. Destinations AeroSur's destination network was organized around Viru Viru International Airport from where it offered services to various cities in South America, as well as direct flights to Miami and Madrid. Fleet Last fleet As of November 2011, the AeroSur fleet consisted of the following aircraft: Fleet development Over the years, AeroSur operated the following aircraft types: Accidents and incidents On 31 December 1997, an AeroSur Fairchild Swearingen Metroliner (registered CP-2321) was substantially damaged when it veered off the runway at Teniente Jorge Henrich Arauz Airport. The two pilots had lost control of the aircraft during take-off run. There were no notable injuries amongst the 18 passengers on board. Awards and recognitions 2008: Named Most Powerful Brand among Bolivian airlines by PricewaterhouseCoopers. 2009: Awarded