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My thoughts are that the AZAZ0909 FLIGHTS are recon, checking out an area and planning before an event takes place. They may also be evidence gathering, or making arrests where the local law enforcement may be compromised.
There are lots of theories, but none are proven at this point in time.
Equally, it could be AZ (Arizona) 09 = Janet Napolitano.
Janet Ann Napolitano is an American politician, lawyer, and university administrator who served as the 21st governor of Arizona from 2003 to 2009 and United States secretary of homeland security from 2009 to 2013, under President Barack Obama.
PFOS is also extensively used in fire-fighting foam, although some high-profile incidents (e.g. Buncefield in the UK) have shown the damage that PFOS foam can have on the environment.
Protein-based foams (based on animal blood) are also used and although the effects are much less than perflouro-based foams, they can create a high chemical oxygen demand in water courses and rivers.
it's not just this. Aluminium Sulphate poisoning in the UK.
The Camelford water pollution incident involved the accidental contamination of the drinking water supply to the town of Camelford, Cornwall, in July 1988. Twenty tonnes of aluminium sulphate was inadvertently added to the water supply, raising the concentration to 3,000 times the admissible level. As the aluminium sulphate broke down it produced several tonnes of sulphuric acid which "stripped a cocktail of chemicals from the pipe networks as well as lead and copper piping in people’s homes.". Many people who came into contact with the contaminated water experienced a range of short-term health effects, and many victims suffered long-term effects whose implications remained unclear as of 2012. There has been no rigorous examination or monitoring of the health of the victims since the incident, which is Britain's worst mass poisoning event. Inquests on people who died many years later found very high levels of aluminium in the brain. Dame Barbara Clayton led a Royal Commission on Environmental Pollution enquiry into the incident.
Immediately after the contamination the authorities said that the water was safe to drink, possibly with juice to cover the unpleasant taste. In an inquest in 2012 into the death of one of the victims, the coroner stated that South West Water Authority had been "gambling with as many as 20,000 lives" when they failed to inform the public about the poisoning for 16 days, a delay he called unacceptable.In the aftermath of the contamination the public were reassured that there was no risk to health. There were allegations of a cover-up and West Somerset Coroner Michael Rose stated: "I found there was a deliberate policy to not advise the public of the true nature until some 16 days after the occurrence of the incident." Following an investigation by the government's Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment, Michael Meacher, the former Environment Minister, claimed that "various associated bodies tried to bury the inquiry from the start." Meacher told one newspaper: "This has become a tug of war between the truth and an attempt to silence the truth."
An April 2013 report by the Lowermoor subgroup of the Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment concluded that exposure to the chemicals was unlikely to cause "delayed or persistent harm" and was also unlikely to cause future ill health.[11][12] In September 2013 the government admitted that there had been a "manifest failure to give prompt appropriate advice and information to affected consumers" and offered an unreserved apology.
Polyaluminium Chloride is also used as a flocculating agent in grey water treatment.
There have also been incidents involving hexavalent Chromium in the US.
Water isn't regulated nearly enough.
Oh look Pacific Gas and Electric Company - can anyone remember Erin Brockovich?
From 1952 to 1966, the Pacific Gas and Electric Company (PG&E) dumped approximately 370 million gallons of chromium-tainted wastewater into unlined wastewater spreading ponds around the town of Hinkley, California, located in the Mojave Desert (about 121 miles driving distance north-northeast of Los Angeles).
PG&E used chromium 6, or Hexavalent chromium, a cheap and efficient rust suppressor, in their compressor station for natural gas transmission pipelines. Hexavalent chromium compounds are genotoxic carcinogens.
In 1993, legal clerk Erin Brockovich began an investigation into the health impacts of the contamination. A class-action lawsuit over the contamination was settled in 1996 for $333 million, the largest settlement of a direct-action lawsuit in U.S. history. In 2008, PG&E settled the last of the cases involved with the Hinkley claims. Since then the city's population has dwindled to the point that, in 2016, The New York Times described Hinkley as having been slowly turned into a ghost town.
PG&E again - how many more times have they caused incidents like this?