DCA has been considered a hazard for years, mainly because of the likelyhood of a crash on landing on a northern approach. Furthermore, a plane destined for DCA could do a pretty much a perfect final approach, only to deviate within the last mile to mile-and-a-half to crash into a very important target, and the military would never stand a chance to intercept it. Even a plane turning suddenly from Dulles takes about 5 minutes to cover the distance from the IAD takeoff/landing path to DCA/Washington, giving the fighters at Andrews a [slight]chance. But with DCA, the time from a flight deviation to a crash is only a few seconds, and there is absolutely no chance of an intercept.