United Airlines Chief Executive Scott Kirby has put forward the possibility of combining his carrier with American Airlines, according to people familiar with the matter. Kirby reportedly presented the proposal to senior U.S. government officials, but those involved say there is no clarity about whether any procedural steps toward a transaction have been initiated.
If pursued, a merger between United Airlines and American Airlines would produce the nation’s largest carrier by market capitalization, surpassing Delta Air Lines. The two companies already sit near the top of the U.S. airline ranking by market value, with United identified as the second-largest and American as the fourth-largest by market capitalization in the U.S. industry.
Beyond market value, the two airlines also have the largest operating fleets among U.S. carriers, each maintaining more than 1,000 aircraft. That scale underpins why any combination of the two would represent a notable consolidation of the U.S. domestic airline industry, which is effectively concentrated among American, Delta, United, and Southwest.
Reports note that a union of United and American would likely draw intensive scrutiny over competitive effects. Observers cited in reporting said such scrutiny would be substantial even under the current administration, suggesting regulatory review would be a central obstacle to any transaction.
Financial markets reacted to the reports in after-hours trading: American Airlines shares climbed 4.5% while United Airlines shares rose 1.1% following the news.
Context and market implications
The two carriers’ combined scale by fleet and market value is a core reason the proposal would reshape the U.S. domestic carrier landscape. Because the market is already dominated by a small number of large carriers, a combination of two of those firms would further concentrate capacity and network footprints.
At present, those involved in the discussions have not indicated that formal merger processes are underway, leaving the proposal at an exploratory stage in which outcomes and next steps remain uncertain.