Not sure what you mean by keeping a log of all flights. I travel quite often due to work that technical details regarding my flight doesn't concern me anymore. But on a similar note, I do keep track of my the places I travel still by writing them down on my website. I found a free website builder which is
hPage.com some years ago and I have been tracking my travels there (kinda like a journal) including pictures, highlights of the trip, and dates travelled for a few years now. I have it on private mood though since I'm not really a blogger type of person. Have everything digital now due to my lifestyle. Thank goodness for the World Wide Web and its software apps!