What do you consider an alternative source of info to OAG, other than another print directory? I confess, I have subscriptions to North America, Asia, and Europe - and I carry the relevant issue when I travel. That way, if my Rome flight misconnects in London, I can quickly know my alternatives and be suggesting them to the ticket agent who is rerouting me. Sure, I carry a laptop - but it's not very convenient to power it up at that moment of stress.

btw, OAG offers bonus points on various airlines when you renew your subscription. I got 2000 AA miles for my last renewal. They often don't offer, but if asked, will always give the bonus code.