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ACI urges overhaul of outdated airport slot allocation to boost competition and cut passenger costs

Executive summary: ACI published a press release urging the modernization of the obsolete airport slot‑allocation system, which it says hinders competition and raises costs for passengers. Slot allocation determines airline access to congested airports; reform could increase competition, improve capacity utilization and lower fares.

Who is involved: Airports Council International (ACI), airlines, airport operators, national aviation authorities and passengers.

Likely next: ACI will likely engage with ICAO and national regulators to advocate for updated slot guidelines, triggering debate among industry stakeholders.

The Airports Council International (ACI) has called for a modern, transparent and collaborative approach to airport slot allocation, arguing that the current system limits competition and imposes extra costs on travelers. The statement, issued simultaneously in French, German and Spanish, highlights concerns that scarce airport capacity is not being used efficiently under the existing rules. ACI’s appeal puts pressure on regulators and industry stakeholders to consider reforms that could improve market access and reduce fares.

What's next — scenarios

Regulatory Status Quo Maintained (50%)

Airlines retain grandfather rights on prime airport slots, preserving existing route monopolies and keeping barriers to entry high for low-cost competitors.

Incremental Slot Trading Reform (30%)

Carriers face pressure to monetize or surrender underutilized slots, forcing network airlines to optimize hub operations and potentially lowering regional fares.

Radical Overhaul and Auction System (20%)

Capital-intensive slot auctions drastically increase operating costs for established network carriers while opening prime hubs to aggressive new market entrants.

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