I don't know about hangars at Mariposa, but be aware that a major wildfire, the Rim Fire is burning in Tuolumne County and into the western edge of Yosemite. The National Park Service is trying to put in fire lines to save the Tuolumne and Merced Groves of Giant Sequoias. This is a very large fire, 130,000 plus acres, 11,000 in Yosemite, and is making it's own weather. If the winds come from the west Yosemite Valley will be filled with smoke although it is currently smoke free. Keep checking the weather as conditions can quickly change.