This list of commercial airliner bombings appears in the Ask a Rocket Scientist section of Aerospaceweb.org. It presents a comprehensive and descriptive catalog of 86 bombings and attempted bombings since 1933, 54 of which resulted in fatalities, and offers some information that might be relevant to the question of airline security.
Airport-security cartoons from The New Yorker’s archives (1938 - present).
We've discussed it before but why not take a look at So You're Going To Fly, a 1939 Popular Mechanics article aimed at first-time flyers.
The impressive Gimli Glider. Yes, seriously: it can be a glider. An amazing story of a commercial pilot with mad emergency landing skillz.