The airline magazine can provide a whole host of at least somewhat interesting features, interesting enough that some of these magazines are popping up online. Features such as:
Crosswords and other word games
Other inflight information - music, movies, short programs
Destination information such as airport plans
Travel advice and tips
Travel-related articles like events or festivals.
Travel info for the business traveler
Non-travel related articles such as celebrity profiles, fashion, etc.
Some of the publications that offer much of the inflight reading material online:
Air Canada's award winning magazine EnRoute has their magazine's feature articles online along with an archive of past features and movie and audio entertainment information.
Alaska Airlines/Horizons Air gives the online reader access to its cover feature, and cover features of past cover features.
American Airlines magazine, American Way offers virtually the entire magazine online. Route maps, lifestyle articles, travel features - even the crossword puzzle is offered online!
Continental Airlines' magazine - Continental has lots of online features including downloadable versions of Sudoku.
A calendar of events, business and travel articles, and destinations off the beaten path are a few of the online offerings of Delta's inflight magazine Delta Sky.
US Airways touts US Airways Magazine as the business traveler's companion and includes travel articles and information.
Hemispheres, the inflight magazine of United Airlines seems to be fully available to Internet users. There are lots of fun and interesting travel facts, an online version of its crossword puzzle, and gourmet themed articles among the many offerings provided for its online readers.
Hana Hou! the inflight magazine of Hawaiian Airlines gives the online reader lots of advice as to their "best of" the Hawaiian Islands. Feature articles from present and past issues are also available for reading.
Southwest Airlines Spirit is more about reader input and will even award prizes for your written contributions.
Destination guides, health and beauty articles and off beat travel articles are some of the features you can find in Easy Jet's online version of its inflight magazine, simply called EasyJet.