Will supersonic passenger jets return to the skies?
Image Credit: Jose Luis Barros/Gulf News  Dubai: After the Concorde was retired by British Airways and Air France in 2003, nobody thought that commercial supersonic flying would ever make a comeback that is until now. An announcement by US-based United Airlines to add 15 supersonic jets to its fleet has set off a perfect storm in the the aviation industry. The Overture aircraft  produced by a Denver-based company called Boom - is to be rolled out in 2025, fly in 2026, and expected to carry passengers by 2029. The rationale behind Uniteds move can be explained in two words: shorter flights. The airplane, which can fly at speeds of Mach 1.7 or roughly 2,000 kilometres per hour, will cut trans-Atlantic flight times by 50 per cent. This means a flight from Tokyo to Seattle will only take 4 hours and 30 minutes, compared to over eight hours now. A passenger can fly from Singapore to Dubai in a matter of 4 hours, instead of the seven taken today. A rendering provided by Boom Supersonic shows the proposed plane. And it's quite the looker. Image Credit: Boom Supersonic via NYT  Challenges with supersonic  One of the biggest disadvantages is the sonic boom - the shock waves created when an object travels through air faster than the speed of sound. This makes a distinctive sound, and although people on board dont get to hear the boom, everyone else in the aircrafts range does. The issue gets a lot more serious when one realizes that aviation accounts for around 2.5 per cent of global carbon emissions, and fuel-guzzling supersonic planes are bound to make the problem worse. However, the Denver company Boom claims that Overture will be the first large commercial aircraft to be net-zero carbon from day one, by running on 100 per cent sustainable aviation fuel (SAF). SAF, which is made using raw materials such as cooking oil and solid waste, can result in a reduction in carbon emissions compared to the traditional jet fuel it replaces. This sounds too good to be true and not everyone in the industry is convinced. Hold on, not so fast  The aircraft is not yet built and there are almost always delays due to technical challenges with technological advances as well as cost overruns, said John Strickland, Director of JLS Consulting. There is also the question of attracting sufficient demand on a wide range of schedules - the only truly profitable route for Concorde was London-New York. Additionally, there will be environmental hurdles to cross, notwithstanding plans to use new generation engines and sustainable fuels.  Strickland, , who previously held senior roles in British Airways and KLM, is not alone in casting doubts. A Linkedin post has referred to Aerion Supersonic, which like Boom planned to build business jets capable of flying nearly twice as fast as commercial aircraft, but was forced to shut down in May due to financial constraints. Before we all commence hyperventilating and thinking Aerion's shutdown was but a mere anomaly, I'm going to wait for some actual cash to change hands, said an aviation industry source. Until then, it's just hype.  I could order 10 or so myself with the same level of commitment and risk as UAL. {But) unless and until Boom demonstrates a new end-to-end rapid development and product delivery system that the US FAA (Federal Aviation Administrator) and airlines accept, color me a skeptic.  The fatal takeoff that soon consigned Concorde to history... Image Credit: AP  Not all bad  Some have taken a more positive view of the development. With the Boom announcement, United has articulated a bold and compelling vision to its stakeholders and shareholders - a good example of visionary storytelling, which is often lacking among airlines, said Shashank Nigam, an aviation expert in a LinkedIn post. It's what distinguishes winning companies from the rest of the crowd.