I know that aircrew have become a minority here, but it should be understood that we are somewhat of a nomadic people. As a result, and as not all of us feel the urge to lug a laptop around, it is public computers in hotels, airports, crewrooms or cafes that are used.
Manual log in is the only option. There is also a good chance that someone have logged in from the location before, so the IP is logged and you can't even view threads without logging in.