As ultra-low-cost carriers like Spirit and Frontier falter, Sun Country has been able to routinely stand out as one of the most profitable airlines in the U.S.
High unit costs, reduced operational efficiencies, and increased competition from network carriers have combined to create a significant challenge for ultra low-cost carriers in the U.S.
If finalized, the rule would ban airlines from charging fees to assign seats to children aged 13 or younger next to their parents or an accompanying adult.
With 'transformational' changes to its business model announced earlier this week, Spirit will be hoping that these numbers are the start of a long-term shift for the troubled airline.
Delta, which has consistently been one of the most profitable U.S. airlines, slightly underperformed in the second quarter, partly due to an oversupply of domestic seats. That could signal trouble for domestic carriers this summer.
The changes come as the Department of Transportation released a final rule that will require airlines to disclose all fees associated with add-on perks.