It would seem that ABC reported the explosion and white smoke on 9/11/2001. I don't know if anyone considers "The Mirror" a reliable source but they report the gag order.
From "The Complete 9/11 Timeline"
9:58 a.m. September 11, 2001: Ed Felt Said to Describe Explosion and White Smoke from Bathroom Call
Edward Felt. [Source: Family photo]A man dials emergency 9-1-1 from a bathroom on the plane, crying, “We’re being hijacked, We’re being hijacked!” [Toronto Sun, 9/16/2001] The operator reports, “He heard some sort of explosion and saw white smoke coming from the plane and we lost contact with him.” [ABC News, 9/11/2001;
ABC News, 9/11/2001; Associated Press, 9/12/2001] One minute after the call begins, the line goes dead. [Pittsburgh Channel, 12/6/2001] Investigators believe this was Edward Felt, the only passenger not accounted for on phone calls. He was sitting in first class, so he probably was in the bathroom near the front of the plane. At one point, he appears to have peeked out the bathroom door during the call. [Longman, 2002, pp. 193-194, 196] The mentions of smoke and explosions on the recording of his call are now denied. [Longman, 2002, pp. 264] The person who took Felt’s call is not allowed to speak to the media. [
Mirror, 9/12/2002]
Entity Tags: Edward Felt
Timeline Tags: Complete 911 Timeline, 9/11 Timeline