It occurs to me that this conundrum is similar to the basic dilemma confronting researchers.
Some simple questions are indeed simple.
This, naturally, assumes the questioner gets the name of the book correctly. Official Airline Guides , either in print, online, or on CD-ROM will tell you this. Multiple online sources can answer this, as will as a phone call to the company. But consider the simple-sounding questions without easy answers. Even if you know the answer to this one, try explaining it to a small child, the most likely source of the question.