Executives at both carriers said their route networks complement each other.
A fiery MD-11 plane crash on Nov. 4 in Louisville, Kentucky, killed 14 people and injured at least 23 when the left engine detached during takeoff.
Staffing problems led to delays throughout October, but they were mostly isolated and temporary. Last weekend, though, saw a change.
United Airlines has resolved its tech issue; delays could still continue at the Reno-Tahoe International Airport. Check flight status.
Alaska Airlines has resumed operations following an undisclosed technical error affecting its entire system for approximately three hours.
The airline announced the change in March, saying at the time that the the new policy would start with flights booked on Wednesday.
According to Reno-Tahoe Airport Authority the incident was minor and caused no interruption to airport operations.
Starting on Thursday, travelers flying from Reno to Austin, Texas, can catch a direct flight.
Frontier's first attempt to merge with Spirit was in 2022, but it was outbid by JetBlue.
It can also respond to help fight wildfires in partnership with the Nevada Division of Forestry and Reno and Sparks Fire.