After reportedly purchasing their flight’s tickets weeks earlier in August of 2001 and while possibly relying on limited radio frequency navigation aids, the accused 9/11 hijackers allegedly guided American Airlines Flight 11 and United Airlines Flight 175 visually into the WTC after descending into New York City airspace from 20,000 - 30,000 foot altitudes, a task made more difficult if not unlikely, had this been attempted through the dense cloud cover that largely hid the WTC just hours earlier on September 10, 2001.