https://www.airzerog.com/zero-g-flights-how-it-works

What is a parabolic flight?
During a parabolic or zero-gravity flight, pilots make a specific maneuver, the parabolic maneuver, several times to recreate a state of weightlessness inside the aircraft for 22 seconds.

For scientific research gravity-free flights, this maneuver is repeated 31 times and reproduces lunar and martian weightlessness, depending on the parabolas.

What is a parabolic maneuver?
The parabolic maneuver or ellipse arc during a Zero G flight is divided into three stages: the parabola pull-up, the parabola, and the parabola pull-out.

Pull-up
The pilot lifts the nose of the A310 Zero G airbus upward from horizontal flight to an angle of 50 degrees.

Passengers experience a pull of 1.8 times that of gravity on Earth. This is called hypergravity.

The parabola pull-up or “nose-up” lasts around 20 seconds.

Parabola
The parabola starts with injection: as the aircraft travels upward the pilots reduce engine speed and the Zero G aircraft follows a ballistic trajectory.

Weightlessness begins when the aircraft enters a parabola during which it is in free fall for 22 seconds.

Pull-out
The nose of the plane is tilted back downward 42 degrees, before the pilots gradually level off the aircraft as they increase engine speed.

Passengers again experience a pull of 1.8 times that of gravity on Earth.

After 20 seconds, the A310 Zero G returns to a horizontal trajectory.

Note because the aeroplane which the Israelis are going on about would not have started a parabolic climb, what would have occurred if their story is or were true is the plane when it took the dive would have cause items, bodies to rising at first just as the the state of Weightlessness kicked in, people would have panicked and knocked into each other.
Most certainly a plastic glass of water would not be still on a fold down tray as in the sky video.
As we need to consider the G force that would have taken place when the flight was pulled up, if this ever really occurred.