There was a nice WWI flight game from Cinemaware on the Amiga called Wings. Between the sections of the game was a diary which was actually quite a good read. I never played the game to the end and didn't get a chance to read the full diary. I wonder if the diary can be found on the internet somewhere as I want to finish it (20 years later...)?
The site Recorded Amiga Games has a long play of Wings here: AMIGA LONGPLAY #378 - WINGS.
It should contain all the diary entries. But you have to pause it to read them. You may also want to skip ahead a little in the video since it's over 9 hours long.
You can either download it from the site or watch in on YouTube here.