Many years ago I read a story about humans who were extracted from various time periods (ranging from cave men to people from the far future) and brought together. The future humans were presented with the scenario to make decisions about their future.
From memory the story was told from the viewpoint of a modern person, who was plucked from an airplane mid flight.
Something reminded me of the story and I started to look for it, without success.
I thought it was "October the first is too late", which has a broadly similar plot, and have been going through my SF Collection looking (and re-reading lots) without finding it. (I am sure I owned the book, but my children had taken to "borrowing" my books, and not all have returned.)