Upvote:1
There is a lot of information about this on the Lufthansa website (ie; paid internet on 90% of the long-haul flights) see: http://www.lufthansa.com/us/en/Fly-Net
My personal experience with any airline is that you are better off calling them because they are often dealing with older planes that don't have services like that and they tend to 'forget' to mention this online.
The service mentioned above would be more than sufficient for what you want to accomplish but is not a free service.
Upvote:2
Haved used it once, Frankfurt to Tokyo in June 2013 (don't remember what kind of plane it was). My usage is mostly the same as yours, and I had no problem with it.
Actually, I had bought 24 hours of wifi access at Frankfurt airport for about 5 euros, and was quite surprised to find that I could also use it on the plane. (If you buy it on the plane, it's 17 euros for 24 hours.) I don't know whether this is still possible, however.