The Alaska Airlines article covered that:
This sounds like a bit of a disconnect. Based on the vast amount of plane info and maps in the device, it seems that the flight crew might need to consult them close to takeoff or landing.
http://avstop.com/feb_2011/executive_jet_receives_faa_authorization_to_use_jepp_charts_on_ipad.htm
February 12, 2011 - Jeppesen announced on Friday that Executive Jet Management has received authorization from the Federal Aviation Administration to use the Jeppesen Mobile TC App for iPad as an alternative to paper aeronautical charts.