The aviation industry is witnessing significant advancements and innovations in engine design and maintenance. Charles Taylor, the Wright brothers' mechanic, was recently honored for designing and building the engine that powered the first aircraft. Meanwhile, Hermeus has started engine testing for the Quarterhorse Mk 2, which is expected to fly at Mach 2.5 before the development of the Mach 4 Mk 3 prototype. Airbus is making preparations to test a hydrogen auxiliary power unit on the A330 airliner, focusing on supporting non-propulsive electrical power needs. Additionally, the U.S. Department of Energy is funding Piasecki's hydrogen VTOL aircraft study, aiming to further research for urban air taxi missions. These developments highlight the industry's commitment to innovation and sustainability in aviation.