My wife has recently become obsessed with the chemtrail issue. We live on the Central Coast of California and she has been quite troubled by the drought conditions here. She was focused on global warming for a few years (which I think is reasonable), but now it has switched to chemtrails. I'm not sure any evidence will talk her out of it, but I want to at least try. Thanks to this site, I already pointed out that a "whistle blower" she mentioned wasn't really blowing a whistle and a Ph.D. wasn't really a Ph.D. It hasn't made much of a dent. The problem is, she looks up at the sky and sees contrails and planes and is now even taking pictures of them. The whole thing seems to have not the least bit of merit to me, but I am not enough of an aviation expert to counter every little point brought up. Specifically, when she looks up into the sky, she see planes blowing contrails, some days more often than others and sometimes persisting longer than others. She contrasts these to other planes that do not seem to have any contrails and days that there are not contrails. I understand the aspects of humidity and noted that cloud cover was heavier today, for example, which should explain why contrails are likely to persist, but she wasn't buying it. I'm assuming that the planes are commercial airlines flying from LA to SF or SF to LA. They might also be flying to and from the small airport in San Luis Obispo, which is nearby. I'm thinking the local planes are flying lower and thus do not have contrails due to the dry air at lower altitudes around here, or are smaller planes less likely to do so. Does anyone know if there are specific flight routes from LA to SF (and points north beyond) that might change from day to day so that planes are overhead one day, but over the sea or elsewhere on another? How many flights would be heading in that direction? Also, would a plane that is not a standard commercial aircraft be able to fly without anyone being able to identify it? How obvious would it be that something is a commercial plane vs. a military plane? Does anyone have any simple points I can make to her along these lines? I won't say I'm optimistic, but I want to at least try to break her out of this cult, as it puts a strain on our marriage. Thanks in advance.