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