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.
The BLS reports that 3,130 writers fell into this category as of May 2013. Independent writers may work across multiple highly paid writing sectors, which can limit available jobs. For example, an author of a successful series of books may also write scripts for the movie versions of his books. Cable and subscription programming also ranked high in terms of pay for writers, according to the BLS. The mean annual salary for writers in this sector was $88,010, while the mean hourly rate was $42.31. Jobs in this sector are in short supply with only 160 jobs reported. Independent writers and authors also work in this sector, which helps to explain the small number of jobs reported.