The North American XB-70 Valkyrie was a “technical marvel” of the 1950s—a Mach 3, 70,000-foot nuclear bomber designed to replace the B-52. -It used a “revolutionary” principle called “compression lift ...

National Transportation Safety Board officials released harrowing details about the midair collision between a United flight and a weather balloon over Utah, leading to an emergency landing.

The NTSB has released its preliminary report on the collision involving flights 5155 and 5047 — a serious ground incident ...