A list of an airlines overnight hotels could be useful to nefarious characters...pretty easy to aquire airline manuals left in rooms while you go out to eat, along with Uniforms, ID badges, Keys, logbooks (containing phone numbers/gate codes/computer entries, etc.)
The information might be available if someone were looking on the internet, but why make it easy for them. For all we know, the guy looking for this was Mohammad Atta's room mate in flight school and was supposed to be the 21st Hijacker on 9/11....I know it's a stretch, but how do you really know.
Basic security doctrine is that the less info an enemy has, the harder it is for them to be effective. This is why discussing what time the crew is gonna meet for dinner or room numbers in public is a bad idea too.