Ever wondered, which airline flies which route and what are the flight options for the given city? Would that not be much easier if there was single source or page listing all the flights departing a airport? or showing flight details between two city pair?. Although no single website exists which could satisfy this needs there are several resources which could help you find that info. Below are some of the useful websites which can help you get that info, which would help you finalize that missing puzzle of your successful award or revenue travel.
Currently in beta flightconnections will help you find what are the "destinations" served from the airport of your desire and if you key in source/destination pair the available airline/flight options between those two airport/city pair. Of-course you could click on one of those airlines and go to one of their "affiliate" booking web-page, but at least you get the info you need.
Open Flights is like a wikipedia of flights. As it is open-source it is maintained by community of volunteers, and thus would have good info albeit some of the info might be wrong. The interesting part is you could view or list flights from a given "airport" or "city" and the data could be either seen as a map or read as a list. You can even sort the data as well as filter per the "airlines". As seen from below snapshots!
This tool would be useful if you know the source and destination as well as the dates of your travel and want to know all the available flight options. So, although limited compared to open flights or flightconnection it is still useful as it can quickly list all the options on various airlines as can be seen from below search.
This website requires a little more info before spitting out the route-map but it is useful if you are looking for a route map by "region" or "airline". You could plug in your short-listing criteria and get set of route-maps which are available. You can see a simple search for American Airlines below yields links to various route maps by region as well detailed info on the "hubs".
Airline Route Mapper
Airline route mapper is another tool which was created by flyertalk member cockpitvisit. You need to download this tool but it does list a fairly comprehensive and updated route map. So, if you are one of those who do lot of search and do not mind installing this tool on your laptop/desktop then this is for you.
Apart from above there is a route map (which might be a little limited in its usage but still useful) for One World Alliance routes which can be found here and Star Alliance routes which can be found here.
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