Plan a flight
Two airports and a cruise speed, and the whole route is briefed in plain English: warnings, pilot reports, winds aloft and the time en route, the weather at both ends and along the way, restrictions, sunset and the radar pictures. For planning, not a briefing.
Type an identifier (SBA, KSBA, 1O2) or a town and pick the airport from the list. One way, with stops, or there and back: each leg is briefed on its own and timed from when you would set off on it, and each leg can have its own speed once the plan is up. Everything comes from the government's aviation weather service and the FAA, refreshed every few minutes. Some routes to try: Santa Barbara to Las Vegas, Santa Barbara to Las Vegas and back, Teterboro to Palm Beach, Centennial to Salt Lake City to Boise, White Plains to Martha's Vineyard.
Along the route
The straight line between the two airports is sampled every ten miles and tested against every SIGMET, AIRMET and restriction area in force; a pilot report within fifty miles of the line counts, and a warning within twenty-five.
Winds and time
The forecast winds at the points nearest the line are read at each legal cruising height for the direction of flight; the head- or tailwind along the track, the ground speed and the time en route follow from the speed you choose.
At the ends
The observation and forecast at both airports, the destination forecast at the estimated arrival, and sunset there, so a flight that lands in the dark is flagged before it leaves.