To me, the most remarkable thing about the modern commercial aircraft industry is how similar the end results are. Only the keen planespotter can tell apart a A350 from a B787, from the outside or the inside, and the Chinese (COMAC) and Russians (Sukhoi) are not even trying to disrupt, just copy. Where are all the delta wings and other exotic designs used regularly in military aircraft?!

IMHO there are two things with the potential to revolutionize passenger aviation brewing right now. One is the possible return of supersonic flight, with Boom racking up some 150 orders already, although they still have a long way to go until first passenger flight in 2029 (not holding my breath). The other is switching from aviation fuel to electric engines, which is inevitable, although the sheer weight of batteries is a much bigger problem for flight than for cars and it's likely going to take a decade plus until they're competitive for longer distances.