This week, Marc and Al had some special guests that made their way to the SimpleFlight studio at KPWK.  Gavin Black, Andrew Haefner, Pierce Lane, and Bill Engelking flew from their respective home bases in Knoxville and Duluth for the show. That, in and of itself, epitomizes what flying clubs are all about.  It's all about adding a social aspect to our flying and infusing some energy into the aviation experience. What's different about their flying club, is that they are part of the Cirrus Employees Flying Club.  While they enjoy unique benefits associated with a club sponsored by an aircraft manufacturer, the value they receive is in many respects, common across all flying clubs.  It's an interesting mix of differences and commonalities.  We're interested in your thoughts on the value of flying clubs.  Join in the conversation on facebook. @simpleflightradio                                   *   *   * Congratulations to our Avgeek of the Week!  @stephenrunkel @stephenrunkel correctly answered our Instagram post asking for the requirements associated with oxygen usage in the cockpit of our general aviation planes.  Stephen knew that FAR 91.211 requires the PIC to use oxygen after 30 minutes at 12,500 feet, use it continuously at 14,000 feet, and offer it to passengers at 15,000 feet.  Not regulatory, but it's also recommended that oxygen is used at 5,000 feet for night operations.  This is due to the improvement in night vision when oxygen is used. If you'd like to be our #avgeek of the week and earn shout out on the show, follow us on Instagram @simpleflightradio