Our roundup of the main aerospace and defense stories making the news this week.

Start-up hypersonic aircraft developer Hermeus has demonstrated mode transition of the company’s in-house designed Chimera turbine-based combined-cycle engine.

As Archer Aviation unveils its four-passenger production air taxi, the Midnight, Aviation Week editors discuss the shifting competitive dynamics in the nascent advanced air mobility market where three rival OEMs with differing approaches push toward FAA certification and operation. 

Startup says it is on track to be among the first eVTOL companies to launch service.

Boeing’s decision to defer development of a new narrowbody has profound and negative consequences for the industry.

Two catalysts could push commercial engine-makers and airframers to speed up their development cycles.

The move comes as Reaction continues its push in the U.S. and elsewhere to develop its pre-cooler technology for high-Mach aircraft and missiles, as well as space access vehicles.

Will Boeing’s decision to focus on steadying production and deliveries, over new products, endanger its long-term market position?