US legacy carriers like Delta successfully neutralized low-cost threats (Spirit, Frontier) by introducing "Basic Economy" fares. Leveraging their scale and loyalty programs, they could price-discriminate, matching LCC prices on a fraction of their seats while maintaining premium pricing on the rest, effectively starving competitors of the price-sensitive traffic they relied on.

Ryanair's success didn't just win market share; it fundamentally reshaped the entire European airline industry. Its model of unbundling every service to achieve the lowest base fare forced legacy carriers like British Airways to adopt similar 'low-cost tricks' to compete on short-haul routes. This has led to an industry-wide degradation of the passenger experience, where once-standard amenities are now paid add-ons.

Despite attractive growth, new airlines struggle to enter the Mexican market due to the incumbents' scale. Volaris and Viva, controlling a large portion of domestic capacity, can strategically add flights and slash prices on any route a new entrant attempts to serve. This pricing power ensures any startup would be driven to bankruptcy within months.

Hedging fuel costs is not a guaranteed win. If an airline locks in a price and the market drops, they are stuck with high costs. Meanwhile, unhedged competitors can buy cheaper fuel, undercut ticket prices, and steal market share, turning a risk tool into a liability.

Fuel represents a much larger portion of a low-cost carrier's expenses (about a third) compared to legacy carriers (a fifth). This structural difference makes budget airlines significantly more vulnerable to fuel price shocks from geopolitical events, forcing them to take more drastic measures.

Overbooking isn't a flat algorithm. Business routes are overbooked more heavily due to flexible traveler schedules, while leisure routes with fixed plans (like a festival) are a huge risk to oversell, as almost everyone shows up. It's a lesson in understanding customer context to manage risk and revenue.

Unlike the consolidated US, Europe's fragmented airline market and abundance of secondary airports are key to Ryanair's success. Ryanair leverages its high passenger volume to negotiate extremely low landing fees with smaller, competing airports, creating a sustainable cost advantage that larger legacy carriers tied to primary hubs cannot replicate.

Unlike industries like railroads that consolidated after bankruptcies, failing airlines are often bailed out or have their cheap assets sold to competitors. This prevents the natural "cleanup" of bad operators, fueling a continuous cycle of price wars and capital destruction.

United's 'Relax Row' signals a fundamental airline industry shift driven by economic inequality. Carriers are moving away from a volume-based model of maximizing seats and toward a margin-based model focused on profitable premium products. For the first time, premium fares are becoming the majority revenue driver for major airlines.