A flight attendant turns back on Colombia's first commercial biofuel flight in Cali on August 21, 2013. LAN Airlines launched on Wednesday its first commercial flight from Bogota to Cali using biofuel of the second generation, allowing the reduction of greenhouse gas emissions, according to local media. (Xinhua/Jhon Paz)

The Airbus A320 of LAN airlines is seen at the Alfonso Bonilla Aragon airport after finishing Colombia's first commercial biofuel flight in Cali, Colombia, on August 21, 2013. LAN Airlines launched on Wednesday its first commercial flight from Bogota to Cali using biofuel of the second generation, allowing the reduction of greenhouse gas emissions, according to local media. (Xinhua/Jhon Paz)

A biofuel sample is shown to passengers of Colombia's first commercial biofuel flight in Cali, Colombia, on August 21, 2013. LAN Airlines launched on Wednesday its first commercial flight from Bogota to Cali using biofuel of the second generation, allowing the reduction of greenhouse gas emissions, according to local media. (Xinhua/Jhon Paz)

Operators of the Alfonso Bonilla Aragon airport receive passengers of Colombia's first commercial biofuel flight in Cali, Colombia, on August 21, 2013. LAN Airlines launched on Wednesday its first commercial flight from Bogota to Cali using biofuel of the second generation, allowing the reduction of greenhouse gas emissions, according to local media. (Xinhua/Jhon Paz)

An operator of the Alfonso Bonilla Aragon airport receives passengers of Colombia's first commercial biofuel flight in Cali, Colombia, on August 21, 2013. LAN Airlines launched on Wednesday its first commercial flight from Bogota to Cali using biofuel of the second generation, allowing the reduction of greenhouse gas emissions, according to local media. (Xinhua/Jhon Paz)