NTSB preliminary report says poor radio coverage prevented presidential helicopter crew from giving controllers the required three-minute departure notice

Commercial flight departed Reagan National while the presidential aircraft was airborne despite post-2025 restrictions

Sikorsky aircraft delivered 23rd unit to U.S. Marine Corps this week, but has not yet assumed the role of "Marine One"

Sikorsky's aircraft has been in development for several years, but had problems such as burning the White House lawn