Dec 31st 2011, 13:43 by N.B. | WASHINGTON, D.C.
GOGO, which provides in-flight Wi-Fi to many American airlines, recently filed for an initial public offering. But as Dan Frommer, a tech writer, reminds us (via Slate's Matt Yglesias), in-flight Wi-Fi is still quite unpopular: just 4% of passengers on flights that offer Gogo Wi-Fi actually pay for the service. (Gulliver wrote about air travellers' unwillingness to pay for Wi-Fi service way back in 2009.)