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An easy way to find out what gate and/or baggage claim area to use (by city, by flight number).
Also a good map of the terminal area.
If the airport serves as a hub, then you may want to have some info on what to do while waiting for a connection (things for kids to do; any exhibits, etc. in the terminals to kill time, etc.).
Hope that doesn't sound too strange, but it may be worth some more organic traffic, and general goodwill.
After I've landed I need to know where I can buy a lighter.
A search function may be useful as a backup - if it's actually useful. A lot of sites have a search function (I guess 'cause they think that they should have one.) that just brings up a laundry list of junk results.
Also a list of airlines serving the airport and an aggregated flight schedule for the airport. It doesn't have to be up-to-the-second with flight delays and cancellations. You can can the airline for that. It's so you can figure out what the direct flight routes are and what days they fly. This is practically the only reason I visit the website for the airport where I live, and this data is woefully lacking.