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But it desended too soon and was possibly going for the Three Mile Island nuke plant instead of Washington.. It's possible that the pilots of flight 93 went into business for themselfs and decided to hit a target that would do some real damage to the USA instead of hitting WTC7..
Shortly after the EFIS was switched to VOR mode, the frequency of the left VOR receiver was set to 111.0 MHz, corresponding to the VOR station located at Washington Reagan National Airport (DCA). At the time the DCA frequency was selected, the station was too far away for its signals to be received by the receiver. If DCA VOR had been in range, the display on the EHSI could have been used to show the airplane’s position relative to an inbound radial to DCA, and thus help navigate the airplane towards DCA. The selection of the DCA VOR frequency in the airplane’s left VOR receiver suggests that the operators of the airplane had an interest in DCA, and may have wanted to use that VOR station to help navigate the airplane towards Washington.