Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Non-stop flights from Europe to Australia could become a reality thanks to a stunning 'blended-wing' plane design with hybrid engines that drastically lowers fuel consumption. Dutch airline KLM has teamed up with Delft University of Technology to produce concept designs that could be the future of planes. The main feature is a wing design that will ensure better fuel efficiency due to the aircraft being more streamlined. The AHEAD aircraft, which stands for Advanced Hybrid Engine Aircraft Development, is being designed to carry 300 passengers over a range of 8,700 miles – which would put the UK within striking distance of .The plane has a huge range - nearly 9,000 miles - as it's very fuel efficientConcept designs released by Dutch airline KLM and technology universityBut chief engineer admits it is a 'long-term study,' with 2050 the target 
 Question:But don't get excited just yet, as _'s concept is a long way from becoming reality.

KLM