WSI InFlight 3.1.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. WSI_InFlight_PC.exe and WSIIF_Client_Configuration.exe are the most frequent filenames for this program's installer. This free software is an intellectual property of WSI. The program lies within Games, more precisely Simulation. We recommend checking the downloaded files with any free antivirus. The most popular versions among WSI InFlight users are 4.3 and 3.1.
From the developer:
WSI InFlight provides an uninterrupted stream of weather and airspace information directly to the cockpit during flight via satellite. Co-developed with NASA and specifically designed for aviation, WSI InFlight’s continuous datalink service keeps pilots aware of situations as they unfold, increasing flight decision confidence. Pilots make better strategic decisions enroute, saving time, reducing costs while maintaining passenger comfort.
You may want to check out more software, such as WSI Fusion or Windows 7 Shortcut Installer, which might be similar to WSI InFlight.