A flight planning system for providing a flight planning tool on a client device includes a flight planning module, a weather module, and an airport module. A flight planning API is configured to communicate with the modules and client device, and receive, via client device hardware, a request for information associated with a selection of one of a plurality of tools corresponding to one of the modules. Accessing the flight planning system includes identifying a user and authorizing access to the flight planning system. The flight planning module is configured to: retrieve, based on the tool selection, information responsive to the request from at least one of a third-party device or another of the plurality of modules; generate an aviation flight plan based on the information responsive to the request; and transmit the flight plan to the client device for display via the client device.