The underlying logic behind charging for checked bags, though, is sound. Though the cost of fuel has gone down in recent years, somewhere between 20 to 30 percent of the cost of your ticket still goes toward fuel costs. And the more weight you bring aboard, the more fuel gets burned during the flight.

Airlines charge significant fees for checked bags because it has become a critical "unbundled" profit center in the modern aviation economy. In 2024, US airlines alone generated over $7 billion in baggage revenue. By removing the cost of luggage from the base ticket price, airlines can advertise lower "headline" fares to appear more competitive in search engines like Google Flights or Expedia. This "pay-for-what-you-use" model allows the airline to extract more money from travelers who need extra service while appearing "budget-friendly" to those with just a backpack. Operationally, charging for bags also encourages passengers to carry less, which reduces the aircraft's weight and fuel consumption. It also lowers the labor costs associated with ground handling and lost-baggage claims. In 2026, these "ancillary fees" (bags, seats, Wi-Fi) often make up the difference between an airline being profitable or losing money, making high baggage fees a permanent fixture of the industry.