same areas as in Flight Simulator 1. Over the next year or two, compatibility with Sublogic Scenery Disks was provided, gradually covering the whole U.S. (including Hawaii), Japan, and part of Europe. Flight Simulator 3.0 − Released in mid-1988 Microsoft Flight Simulator 3 improved the flight experience by adding additional aircraft and airports to the simulated area found in Flight Simulator 2, as well as improved high-res (EGA) graphics, and other features lifted from the Amiga/ST versions. The three simulated aircraft were the Gates Learjet 25, Cessna Skylane, and Sopwith Camel. Flight Simulator 3 also allowed the user to customize the display; multiple windows, each displaying one of several views, could be positioned and sized on the screen. The supported views included the instrument and control panel, a map view, and various external camera angles. This version included a program to convert the old series of Sublogic Scenery Disks into scenery files (known as SCN files), which could then be copied to the FS3 directory, allowing the user to expand the FS world. Flight Simulator 4.0 − Released in late 1989 Version 4 followed in 1989, and brought several improvements over Flight Simulator 3. These included improved aircraft models, random weather patterns, a new sailplane, and dynamic scenery (non-interactive air and ground traffic on and near airports moving along static prerecorded paths). The basic version of FS4 was available for Macintosh computers in 1991. Like FS3, this version included an upgraded converter for the old Sublogic Scenery Disks into SCN files. A large series of add-on products were produced for FS4 between 1989 and 1993. First from Microsoft & the Bruce Artwick Organization (BAO) came the Aircraft and Scenery Designer (ASD) integration module. This allowed FS4 users to build custom scenery units known as SC1 files which could be used within FS4 and traded with other users. Also, with the provided Aircraft Designer Module, the user could select one of two basic type aircraft frames (prop or jet) and customize flight envelope details and visual aspects. ASD provided additional aircraft including a Boeing 747 with a custom dash/cockpit (which required running in 640 × 350 resolution). Mallard Software and BAO released the Sound, Graphics, and Aircraft Upgrade (SGA), which added digital and synth sound capability (on compatible hardware) to FS4. A variety of high resolution modes also became available for specific types of higher end video cards and chipsets, thus