It is not the generation nor persistence of the trails that interests me, it is that other aircraft, some leaving trails and others not, INVESTIGATE how other previously left trails have deformed.
According to the Bureau of Labor Statistics, as of 2010 writers and authors earned a median salary of $55,420 per year, or $26.64 per hour. These numbers are for freelance writers and authors of books, though, and novelist income is harder to pin down because usually, income depends on book sales and contracts.
According to the WGA West, screenwriters in Hollywood earned a combined total of $331 million last year, down nearly 25 percent from 2009. But some of them are doing pretty well. A screenwriter who sells a draft to a major studio can earn about $100,000, and a hot writer can score $1 million or more.