Do low-cost airlines hold down fares in a consolidated industry?
Core argument: Average one-way fares on the Detroit–Philadelphia route fell from over $308 to $183 after Spirit Airlines entered in 2016, illustrating the downward price pressure low-cost carriers exert despite consolidation into four dominant major airlines.
Despite the consolidation of major carriers into four dominant players, low-cost airlines like Spirit and Frontier continue to exert downward pressure on ticket prices, maintaining affordability for consumers. For instance, when Spirit Airlines entered the Detroit-Philadelphia route in 2016, average one-way fares dropped from over $308 to $183, illustrating the significant impact of low-cost carriers. This competitive dynamic, often referred to as the "Southwest effect," has been shown to reduce average fares by $45 when such airlines serve a market. Major carriers like United and American have responded by introducing "basic economy" fares to attract price-sensitive travelers. While the average round-trip domestic ticket cost rose slightly to over $490 in the first half of the year, the presence of low-cost carriers helps moderate these increases, benefiting consumers despite investor concerns over fare competition and capacity growth.








