National Parks Airways ...

Here's a wonderful old sticker issued by a company called National Parks Airways, probably the first commercial airline to operate in Montana. NPA began carrying passengers and mail between Salt Lake and Great Falls in 1928, stopping in Butte and Helena along the way. For a time in the 1930s, the airline lived up to its name by detouring its flights via West Yellowstone in the summer, landing at a little grassy airstrip right at the edge of town.

The airline's later stickers employed a flying-eagle logo, but the Native American iconography on this one is very cool, I think.