I have located a few videos which show airplane refueling. These should help to provide an antidote to the fear brough about by ignorance.
The claims that airplane fuel contains aluminum in sufficient mass to create a plume hundreds of miles long through additives would require hundreds of tons of aluminum to be incorporated into the fuel. Aluminum is a solid substance and would be visible. This video shows how fuel trucks have a sump at the bottom to collect foreign matter, dirt, metal, or water. The sumps are checked regularly by the refueling operators as shown, and foreign material would be seen. The fuel operator would be derelict in his duties to allow contamination of any kind, and be responsible for a crash if he did so:
This video shows the fuel operator taking sump samples, doing a visual check to see that the fuel is "clear and bright", and some simple field tests both from the truck and at the tanks. This is a serious and very responsible job performed continuously thousands of times daily worldwide.
Furthermore, the airplanes themselves have sumps on their tanks, and visual checks are also made of these, as seen at 2:20 in this video. The video shows in detail fuel procedures including the fact that fuel is metered into this plane by weight, not gallons. Weight is used because stability of the plane is very important and stability depends on the weight of fuel. Pilots know what weight to expect and how far a given weight will take the plane. If a large mass of aluminum or other substance were added to the fuel, it would decrease the plane's range and be noticeable. Unusual trim conditions caused by unusual weight of fuel would also be an indication of problems. Fueling an airplane is a serious matter, because the pilot wants to live through the flight. Running out of fuel or carrying sub-quality fuel is not like spending some time on the side of the road or calling for roadside assistance, it is a matter of life or death for the pilot and passengers as well as the job of every person in the fuel supply chain. Risking safety by putting off quality fuel into an airplane is simply not an option.
Fuel additives such as Prist or Stadis 450 are sometimes claimed to create "chemtrails". Prist prevents icing of fuel in case small amounts of water form in fuel tanks which could possibly freeze and block fuel lines. It is added at the
extremely low rate of 0.1 to 0.15% of the fuel volume(~1 gal. per 1000 gal.) by metering from a small container during fueling as seen at 1:50 during this video. Stadis 450 prevents fire producing sparks from happening in fuel system components, and is added at a
MUCH lower rate of 0.00013%:
I hope this puts some perspective on these claims. Readers should be aware that this sort of information is not being shown inside the chemtrails believer camps because the leadership prefers that their followers not know the whole story, thus maintaining the hype of fear and eliciting an emotional rather than a factual response.