Did You Know- 9/11 and the FAA Tapes

What was on the tapes that the FAA made of interviews with air traffic controllers that were in contact with the fateful planes on 9/11? We'll never know because they were destroyed before being heard, transcribed or copied. My favorite quote is:

"The destruction of evidence in the Government's possession, in this case
an audiotape -- particularly during times of national crisis -- has the effect
of fostering an appearance that information is being withheld from the
public."

"Appearance that information is being withheld from the public?" Information is being withheld from the publc. "Why?" is the question that we need to answer...