A 1979 OAG indicates a short-lived Yosemite Airlines, flying between SFO and a few Sierra Nevada points: Lake Tahoe, Columbia, and Yosemite National Park. Where did Yosemite National Park have an airport? Is it still there? IATA codes seem to indicate OYS for Yosemite National Park Airport, but I can't find such an airport on current maps. This is not to be confused with the existing MPI Mariposa-Yosemite Airport, somewhat to the south (nor FAT Fresno-Yosemite International Airport! a more recent name).
Any historians or Californians with an idea? Was OYS an airport like Colorado's Avon Stolport -- once there, but now gone? Did any other airlines attempt service to this airport? What was Yosemite Airlines?