I work at NRL, east of DCA and about 500 yards south of the crash. Can confirm that it is not unusual for flights to pass directly overhead of us, however I don’t understand the statement that this was a new flight path.
What it means is that the aircraft was on approach into runway 1 (ILS) and then on ATC instruction changed runway to 33 (no ILS). This required a "jog" in flight path -- a slight right turn followed by a left turn, to account for the different orientation between the runways. You can see the turns on the ADS data. Crash happened right at the end of the second turn.
