By David Shepardson

WASHINGTON (Reuters) – Groups representing major airlines criticized the Biden administration's inquiry into air travel competition, requesting a 60-day extension beyond the December 23 deadline.

Carrier groups including Airlines for America and the International Air Transport Association stressed the need for more time to gather information on the competitive air transportation marketplace. They cautioned against rushing the process during the holiday season, which could affect resources and the quality of the data collected.

The U.S. Department of Transportation (USDOT) is considering the request for an extension and emphasized the importance of a competitive aviation sector for reliable service and fair pricing. The Justice Department has not yet commented on the criticism.

Tensions between airlines and the Biden administration have increased, particularly regarding airline mergers, pricing practices, and worker experiences. President Biden aims to enhance competition in the airline industry, which has involved aggressive actions against consolidations.

In addition to the ongoing inquiry, USDOT recently launched investigations into frequent flyer programs and is preparing new customer service proposals.

A letter from various airline groups, including American Airlines, Delta Air Lines, and others, expressed that the inquiry's outcomes could significantly affect future air transportation competition, potentially harming the public.

The Justice Department has previously blocked JetBlue's acquisition of Spirit Airlines and enforced conditions on Alaska Airlines' purchase of Hawaiian Airlines.

Airlines for America also suggested that the timing of the inquiry, just days before the presidential election, indicates political motives.

For decades, mergers have led to four main airlines—American, Delta, United, and Southwest—controlling 80% of the U.S. domestic passenger market.