Just as we use the engine run-up before takeoff as a final check that the airplane and its engine appear ready for flight, at many FBOs we also have a final opportunity to check the weather. Today, FBOs typically have computer terminals for "computerized weather and flight planning" that provide online access to the free DUATS providers or other online subscription weather providers, like Trade-A-Plane with its weatherTAP.com. In addition to online services, several companies, including WSI with its PilotBrief and DTN/Meteorlogix's MxVision Aviation Sentry, offer FBOs weather products downlinked from satellite. The weather products available for our final preflight check are virtually everything we've used in our preflight planning, including Nexrad displays, satellite images, other maps with winds aloft, outlines of sigmets and airmets and active TFRs. With the last minute check, when we go out to the airplane we should have a very good idea of whether the weather is good to go.