[raintrees]

Suggestion: After you have a reasonable facsimile of a working log for pilots (if you choose to go this route), consider generalizing/expanding for scuba divers - Same kind of honor-system log-book for dives performed. I would imagine there are other disciplines that would benefit, as well...

[jacquesm]

Good thinking! There may be many more like that actually. Mountain climbers ? Para jumpers ?

[edge17]

I was about to suggest mountain climbers. I use some of the services on summitpost (climbers logs etc). The site has a vast amount of information, but it's backend is garbage. I routinely use google to extract information out of the site.