National airlines operating scheduled service to locations in Wyoming include Allegiant Air, American Airlines, Delta Air Lines and United Airlines, as of October 2015. Regional carrier Skywest Airlines operates flights to Wyoming as Delta Connection and United Express.
American Airlines, Delta Air Lines and Skywest Airlines operate year-round service to Jackson Hole Airport, Wyoming's busiest airport. United Airlines serves Jackson Hole only during the ski season. Jackson Hole Airport had 308,000 passenger boardings in 2014, accounting for more than half of all boardings in Wyoming.
Casper–Natrona County International Airport, Wyoming's second-largest airport, has scheduled service through Allegiant Air, Delta Connection and United Express. Sky West operates service to Casper as Delta Connection and United Express, and Trans States Airlines also operates as United Express. Casper Airport had 103,000 passenger boardings in 2014.
Although Cheyenne is Wyoming's largest city, Cheyenne Regional Airport's only commercial service is to Denver via Great Lakes Airlines. Many visitors to the city fly into Denver instead.
Among smaller destinations, Yellowstone Airport in Cody serves tourists with service to Salt Lake City on Delta Connection, operated by Skywest. Delta Connection also serves Gillette and Rock Springs with service operated by Skywest. United Express has scheduled service to Laramie, Riverton, Rock Springs and Worland.