On September 11, 2001, hijackers affiliated with al-Qaeda seized four passenger jets.
American Airlines Flight 11 slammed into the World Trade Center’s North Tower at 8:46 a.m. United Airlines Flight 175 hit the South Tower 17 minutes later.
American Airlines Flight 77 struck the Pentagon at 9:37 a.m.
United Airlines Flight 93 crashed near Shanksville, Pennsylvania, at 10:03 a.m. after passengers and crew members fought back against the hijackers.
Nearly 3,000 people were murdered.
Yet despite the extraordinary amount of evidence accumulated since that day, alternative explanations continue to flourish.
One of the strangest claims is that there were no aircraft at the World Trade Center at all.
Under the so-called “no planes” theory, the aircraft seen approaching the towers were supposedly sophisticated holographic projections.
There is one immediate problem: technology capable of accomplishing this does not exist.
Creating a convincing three-dimensional image of a Boeing 767 moving through open sky — visible simultaneously from countless angles, locations, cameras, and distances — is fundamentally different from projecting an image onto a screen.
A projection is also light.
It has no mass.
It cannot smash windows, rip through a building, destroy structural components, scatter aircraft wreckage, or deliver thousands of gallons of jet fuel into an office tower.
The evidence from September 11 does not consist merely of television footage, either.
The aircraft were tracked. Passengers and crew members communicated with people on the ground as the hijackings unfolded. Aircraft debris was recovered. Human remains were identified.
The hologram explanation therefore requires considerably more than believing television images were manipulated. It requires virtually every independent category of evidence to have been fabricated simultaneously.
Then there is the controlled-demolition theory.
Some versions are combined with the “no planes” claim. Others accept that actual airliners struck the towers but maintain that explosives ultimately brought the buildings down.
That second version immediately raises an obvious question.
If hijacked passenger aircraft had already smashed into the towers at high speed, heavily damaging them and starting enormous fires, why would conspirators need the vastly more complicated step of secretly wiring two of the world’s most recognizable skyscrapers for demolition?
The aircraft impacts ignited fires across multiple floors.
A common argument is that jet fuel could not melt structural steel.
That statement is largely beside the point.
Steel does not have to turn into molten metal before it loses its ability to carry enormous structural loads.
At sufficiently high temperatures, steel progressively loses strength and stiffness. The official engineering investigation by the National Institute of Standards and Technology concluded that impact damage, dislodged fireproofing and prolonged fires weakened the structures until collapse became inevitable.
The argument that the towers dropped neatly “into their own footprints” also fails when compared with what actually happened throughout the World Trade Center complex.
The destruction was anything but neatly contained.
Debris tore into neighboring structures. Buildings throughout the complex were heavily damaged or destroyed. The surrounding area was buried beneath an enormous field of steel, concrete and other wreckage.
St. Nicholas Greek Orthodox Church was destroyed.
World Trade Center 7 suffered extensive damage and fires before collapsing later that afternoon.
FEMA ultimately documented catastrophic damage across numerous major structures surrounding the towers.
That is hardly the picture of a carefully contained commercial implosion.
But perhaps the biggest obstacle facing the controlled-demolition argument is logistical.
Preparing a large steel-frame building for intentional demolition is not something a handful of people accomplish over a weekend with boxes of explosives.
It is a major engineering operation.
Consider the J.L. Hudson Department Store in Detroit, demolished in 1998.
The 25-story structure was one of the largest steel-framed buildings ever intentionally imploded in the United States.
Its demolition required extensive planning and preparation.
According to project information, thousands of explosive charges had to be positioned at more than a thousand locations. Miles of detonating cord and thousands of precisely arranged delay elements were involved.
The entire process took months.
Now compare that undertaking with the World Trade Center towers.
Each tower stood 110 stories tall.
Secretly converting buildings of that scale into controlled-demolition projects would have required extensive access to structural components across numerous floors.
Workers would need to expose columns, cut or weaken structural members, place charges, run wiring or detonating cord, install triggering equipment and conceal everything afterward.
And they would have needed to accomplish it inside two occupied skyscrapers.
That presents another major problem.
Tens of thousands of people regularly entered the World Trade Center complex.
There were office employees, security personnel, maintenance crews, elevator technicians, delivery workers, contractors, building managers and visitors.
A clandestine demolition project of unprecedented scale would presumably have generated construction noise, dust, debris, unusual elevator traffic and significant movement of equipment and materials.
Structural material removed during preparation would have had to go somewhere.
Explosives and equipment would have had to come in.
Workers would have had to move throughout secure areas without raising alarms.
Yet no credible evidence has emerged showing hundreds of demolition workers secretly spending months converting the Twin Towers into giant explosive devices.
There is another important distinction.
Commercial controlled demolitions rely on carefully positioned charges designed to destroy specific structural supports in a predetermined sequence.
Those explosions are not subtle.
The detonation sequence produces unmistakable explosive reports immediately associated with structural failure.
What was visible on September 11 was different.
The collapses initiated high in the towers, around areas already devastated by aircraft impacts and fires, before progressing downward.
That sequence fits the catastrophic structural failure explanation far better than the conventional controlled-demolition model.
None of this means Americans should stop asking questions about September 11.
Governments deserve scrutiny. Intelligence failures deserve investigation. Officials should be challenged when evidence warrants it.
But skepticism works both ways.
A theory does not become stronger simply because it challenges an official explanation. It still has to account for physical evidence, engineering principles, witnesses, logistics and competing explanations.
The hologram theory requires technology capable of doing something no demonstrated projector could accomplish — while somehow reproducing the physical effects of an actual passenger jet.
The demolition theory requires an unprecedented covert engineering project inside some of the busiest office buildings in America without producing convincing evidence of the preparation required.
Extraordinary allegations demand evidence proportional to their complexity.
After a quarter-century of investigation and debate, that remains the central problem confronting both theories.
