U.S. military helicopter crashes like the one that took down a commercial American Airlines flight over the Potomac River in Washington, D.C., on Wednesday night are very rare, but there has been an ...

YEARS. HE’S HERE NOW WITH THE NEW QUESTIONS BEING RAISED. MIKE MARIA THE NTSB FIRST RECOMMENDED THAT THE MBTA INSTALL A SYSTEM THAT PREVENTS COLLISIONS ON THE GREEN LINE. NEARLY 20 YEARS AGO, AFTER ...