The mysterious and potentially revolutionary Celera 500L aircraft may fly soon

Beyond that, the patent documents do lay out a case for disrupting traditional ‘hub-and-spoke’ commercial aviation models and offering improved efficiency in aircraft performance to, in turn, reduce inefficiencies in passenger air travel. Otto Aviation has been working on the aircraft for nearly a decade already and it is clear the company has been considering different engine arrangements in that time. Initial flight testing of the engine began in 2012 using a modified Yakovlev Yak-52 aircraft and the A03 received European Aviation Safety Agency approval in 2014.

Source: www.thedrive.com