Not to mention externalities like cost of maintaining & developing that massive flight app, tech support for these devices, maintenance and repair, charging schedules, theft costs, etc.
Oh course, the people who managed the print edition can do some of this work, but imagine most of them will be let go and replaced with an ipad helpdesk and app development department as well as QA and all the management involved in making it all happen.
I'm certainly not against progress, but there's a lot more here than just "we're saving weight/paper."
Just a thought, but 38lbs isn't a lot. I'm surprised these companies don't incentivize people to stay thin and healthy. A crew is like 6 people. If they all lost 5lbs then that's 30lbs right there and all this gas savings. Heck, why not weigh me and charge me my cost by weight and the weight of my luggage.