Las Vegas arguably wouldn’t exist without developments in mass national transit. This photography and memorabilia exhibition, Desert Skyways: 75 Years of Clark County Aviation, looks at air travel, which has played a critical role in the city’s growth as an international tourism hotspot. Staged at the Clark County Museum, its companion pictorial exhibit will be on display at the Howard W. Cannon Aviation Museum in Terminal 1 of Harry Reid International Airport through Jan. 22. The airport exhibit is free to visitors and open 24 hours a day. Clark County Museum is open 9a-4:30p. The show runs through Feb. 18.