normal ops is to have a sheet under the plastic bit of your kneeboard, and record on there for transfer later.
A few wizz kids do it on their mobile phones and it speaks to a server somewhere at the end of play and uploads your days flying. Used to think that it was a bit of a geeky thing to do. Until a major FTL cock up happened and the geek and the internet had all the answers in seconds instead of me taking 30mins and lots of swearing.