Official Airline Guide
I just noticed that the Official Airline Guide (OAG) is still being issued in print format. Basically a combined list of airline schedules, I can't think of a single reason why this continues to exist.
Anybody still use this? I can't imagine why a Travel Agent would want it - everything they need should be online. As a traveler, I just use ITA and a couple other sites that are more comprehensive for European travel.
I can't imagine pulling this huge book off the shelf to look up who flies where.