I just added a post at aerovintage.com that explores the history of this somewhat obscure civil B-17 N7726B, that started as the XPB-1W with the Navy. It crossed paths with Owen Williams, the organizer of California-Atlantic Airways, but only briefly. It ended up in Peru flying as OB-SAB-576 but crashed in March 1963. End of story. But what I posted is detailed...probably too detailed for most, but I think it is worthwhile to get information out of files and on to the internet so it is more widely available to researchers now and in years to come. So, take a look if you dare...