Can a passenger jet fly 500 mph at 700 feet altitude?
The airplane's total drag determines the amount of thrust required at a given airspeed. Thrust must equal drag in steady flight.

The equation used to calculate drag, D, is:

D = 1/2 V^2 S CD

D - Drag (the density of the air)
V - velocity of the air (air speed)
S - surface area of the aircraft
CD - coefficient of drag

The coefficient of drag is calculated based on the angle of attack and shape of the aircraft. The angle of attack is the angle between the direction of the wing (chord line) and the relative wind of the aircraft. —Dan Johnston source

Using a standardized weather conditions table, air density (rho) at 35,000 feet altitude is less than one percent of that at 1,000 feet (1.1 kg/m3 at 1000' vs. 0.0082 kg/m3). Expressed another way, air density at 1,000' is 134 times greater than at 35,000'. source

(notes courtesey of Morgan Reynolds)
Thrust would have to be 134 times greater than at 35,000 feet.
Rear Projection - the original video composite

Does the camera motion on the foreground match the camera motion on the background?
FOX Chopper 5

Total Error - Camera Motion Error = Less Error
Nose Out Sequence

"3 Airplane Noses, and 3 Alleged Dust Explosions"
Wake Vortex
Wingtip vortex is relatively stable and can persist for several minutes.
Link to CERFACS study on Wake Vortex
Naudet 1st hit explosion. Where is the vortex?
My Critics
Ryan Mackey

NASA engineer

"RMackey" on JREF forum

Ryan Mackey bio

Article – “Testing for Absurdity”

by Ryan Mackey

Methodology for quickly evaluating whether or not a theory may be dismissed as absurd.

"Example #2 - Analysis of television news footage proves that, instead of jetliners hitting the World Trade Center as was widely reported, the event was hoaxed using digital video editing techniques and special effects. (thread)"

"The theory presented is not complete, because it does not describe how the attacks really were carried out (and leaves no readily apparent candidate), who did this, or why."

"The evidence presented in support of this theory is disputable on its face, and the theory makes no predictions, testable or otherwise."

"Methods of calculation are ad hoc and nonstandard, permitting no easy review."

 

"There are no positive adjustments. There are, however, several negative adjustments:

* The unsupported and exceptional assumption that video editing capabilities of this sophistication exist

* The assumption that all major news organizations are complicit in this plot

* The repeated refusal to address those who witnessed the impacts, rather than finding out about them through news organizations

* Repeated arguments from personal incredulity regarding the phenomenology of the collapses that eventually followed"
Eric Salter

Video Engineer
Why is it so important that Eric Salter pretend that a helicopter shot was perfectly stable?

False premise (perfect stability)

Straw Man (chroma key)

Margin of Error (no control cases)

Misses the insight (subtracting camera motion error from total error)
Anthony Lawson
1. Layer Mask on Chopper 5 - moving or stationary?

2. Airplane nose - Every frame exactly the same?

3. Video fakery + real explosions - Split-second timing?

4. Discontinuities in Naudet 2nd hit - Edits or stop-and-start?