Steven Schwankert WLAN or INTRANET has no meaning for the average person. Including WIFI these are all technical words. The word WIFI means what it means, not Internet, it's a technical word and the common thing, when doing public announcements is to be technical.
Don't get me wrong, I thing AirChina is at most average and I rather take any other airline if available, but getting pissed off at something like this just come accross like ignorant and petty.
Steven is right: except for a small segment IT professionals, the entire world now perceives the term "Wi Fi" to mean "wireless internet connectivity," technically incorrect or not. It may be an incorrect assumption but it is common enough parlayance that to use it without qualifying "Wi Fi Intranet" is simply misleading on the part of Air China.
I am reminded of the guy who painted my flat, and when he was finished and presented me with the mottled, uneven mess, said: "Oh you didn't say you wanted an even coat. If you'd like that, I can do that be repainting it again -- that will cost extra"
PS for more in this vein Woman Files Class Action Against United Airlines for Lying About Wi-Fi