This week, Aviation Week publishes two editions. On the cover far left, a YCH-53K engineering development aircraft sits on a runway at Sikorsky’s final assembly and test center in West Palm Beach, Fla., in this Sikorsky photo by Dean Sfikas. The all-new design for the U.S. Marine Corps features three times the lift capability of the CH-53E helicopter it superficially resembles (see page 45). Elsewhere in both editions are our annual Top-Performing Companies analysis (page 48) and articles on United Airlines (page 37), electric propulsion (page 40), the impact of U.S.-Russian tensions on the space sector (page 26), SpaceX (page 28) and the Orbital-ATK merger (page 30). The cover of our MRO Edition features a GE90 engine in AFI KLM Engineering & Maintenance’s new test cell at Paris Charles de Gaulle Airport. Photo by Patrick Delapierre/AFI KLM E&M. That edition features additional articles on maintenance, repair and overhaul.