US, April 16 -- The global aviation sector is reacting to reports that United Airlines has explored a merger with American Airlines-a potential consolidation that could reshape the competitive landscape of the U.S. airline industry and intersect with Donald Trump's political and economic philosophy.

Early-stage idea, not a formal deal According to industry reports, United CEO Scott Kirby informally raised the possibility of combining the two carriers in discussions with policymakers. However, there is no confirmed merger agreement or ongoing negotiation, and both airlines have remained publicly silent.

A mega-carrier in the making If realized, a United-American merger would create the world's largest airline, potentially controlling up...