On the high altitude chart it shows the area of J110 airway is unavailable, passing through R-2508 between Las Vegas and San Francisco. I was wondering how airliners route themselves on destinations between the SF Bay area and Las Vegas? Also, on departures out of OAK and SJC, how are those planes routed onto their routes going toward the Southeastern U.S.?

Hi,The J110 within R-2508 is normally available in weekends, so then aircraft operators may file DCT FUZZY J110 CZQ MOD2 from Las Vegas to San Francisco. On weekdays however, they usually have to file around R-2508, either on the north side via MCCRN2 BTY J92 OAL MOD2, or on the south side via BOACH1 HEC DCT PMD DCT BSR BSR2. Although the southern route is a bit longer, it can be used to avoid busy airspace, bad weather etc.The same goes for the route from San Francisco to Las Vegas, where aircraft operators may file something like PORTE3 WAGES DCT CZQ J110 FUZZY FUZZY6 in weekends, and a route around R-2508 during weekdays. A common route around R-2508 is PORTE3 WAGES DCT CZQ DCT BIH DCT LIDAT J92 BTY SUNST1.OAK and SJC departures also have the three options of flying through, or north or south of R-2508. Usually they take the northern route when J110 is not available, but this will not always be possible due to other traffic, weather and so on. If they take the northern route, they normally fly via the J58 or J80 to MLF before turning south.Hope this helps... :)Cheers,http://home.planet.nl/~duijn181/cu2/koen.jpg