Frontier's first attempt to merge with Spirit was in 2022, but it was outbid by JetBlue.
Frontier is optimistic that it can get a deal done this time around.
The announcement comes less than two weeks after the Transportation Department fined JetBlue $2 million for chronic delays.
The two weekends on either side of Christmas are tempting a lot of people to head out earlier.
The last bankruptcy by a major U.S. carrier was when American Airlines simultaneously merged with US Airways in December 2013.
The department will take comments on the proposed family seating rule for the next 60 days before it crafts a final rule.
The deal is valued at $6.6 billion when accounting for the assumption of debt and operating lease liabilities.
For the first time in a decade, the Reno-Tahoe International Airport says it topped four million passengers in 2017, an increase of 9.6% over 2016.
The Reno-Tahoe International Airport is hosting a celebration Tuesday for its inaugural flight to Austin on Frontier Airlines.
Frontier Airlines announced Tuesday that they’re beginning service between Reno and Denver this autumn. Frontier last served Reno-Tahoe in September 2007, a full 10 years ago.