The World in 2025
In 2025, the global civil aviation system was once again reminded of the inescapable reality that the skies, while governed by law and sustained by international cooperation, are never insulated from the vicissitudes of geopolitics and security concerns. The closure of airspace over critical regions and the temporary interruptions of flight operations in response to conflict or security threats underscore the delicate balance between sovereignty and the collective interests of the international aviation community. When military tension or security risks intersect with commercial flight paths, the seamless operation of civil aviation is disrupted, revealing both the resilience and the vulnerability of the legal and operational frameworks upon which international flight depends.
The airspace over the Taiwan Strait, the Indian subcontinent, and parts of the Middle East witnessed closures and restrictions that, while temporally limited, had profound operational consequences. Pakistan’s selective closure of its airspace during military tensions with India, the temporary suspension of flights over the Gulf States amid heightened regional hostilities, and Iran’s own airspace restrictions exemplify the assertion of sovereignty in response to perceived security imperatives. These actions, while lawful under the principle of complete and exclusive territorial sovereignty enshrined in the Chicago Convention, nevertheless produced a cascade of operational challenges. Airlines were compelled to reroute, flights became longer and less fuel efficient, and the predictability upon which safe and orderly air navigation depends was undermined. The result was a tangible demonstration that the exercise of sovereign prerogative, even when justified, carries externalities that affect not only the parties directly involved but the entire international aviation system.
Equally telling were incidents in Europe, where non-state threats, such as drone incursions, led to temporary closures of airspace over airports in Copenhagen, Oslo, Vilnius, and Moscow. These episodes illustrate the evolving character of aviation risks in the twenty-first century, where threats are no longer confined to the conventional military domain. Unmanned aerial vehicles, whether drones or high-altitude balloons, challenge regulators and airlines alike, compelling rapid operational adjustments and, in some cases, invoking the formal closure of critical flight paths. The consequences, though often temporary, are real: delays, rerouting, and increased operational complexity demonstrate that the safety of international air navigation cannot be taken for granted.
From a legal perspective, these events illuminate the tension inherent in the international aviation system. The Chicago Convention envisages the development of civil aviation in a safe, orderly, and cooperative manner, yet it also affirms the complete sovereignty of States over their airspace. The closure of airspace for security or military reasons is consistent with sovereignty, yet it also tests the collective obligations that underpin international law and the expectations of the aviation community. When repeated or prolonged, such closures can fragment airspace management, erode trust, and weaken the predictability upon which global aviation relies. The normative challenge, therefore, is to reconcile the legitimate exercise of sovereignty with the duty to preserve the integrity, safety, and efficiency of international air transport.
In reflecting on these events, it becomes evident that civil aviation is sustained not only by treaties and regulatory instruments but by the disciplined exercise of responsibility by States, regulators, and operators alike. The international aviation system remains resilient because of the mutual recognition that individual actions have global consequences. Airspace closures in 2025 serve as a reminder that safety, cooperation, and legal compliance are inseparable. The protection of civil aviation must remain a shared enterprise, one in which sovereignty is exercised with due regard for the collective good, and where operational disruption is minimized through transparency, coordination, and adherence to international norms.
The Paradox and Challenges
Civil aviation has always been a paradox in motion. Aircraft traverse borders with effortless regularity, yet the law that governs their movement remains anchored in the deeply terrestrial concept of sovereignty. This paradox is not a flaw in the system but its defining condition. From its inception, international air law has been an exercise in reconciling the universal with the particular, the collective interest of humanity in safe and orderly flight with the legitimate prerogatives of States over their own airspace. As the aviation community approaches 2026—amid geopolitical fragmentation, technological acceleration, and regulatory fatigue—the question whether air law is truly international assumes renewed urgency, not as an academic abstraction but as a practical imperative.
The Chicago Convention of 1944 was conceived at a moment when the world was weary of conflict yet cautiously hopeful of cooperation. Its genius lay not in diminishing sovereignty but in disciplining it. By affirming the complete and exclusive sovereignty of States over their airspace while simultaneously binding them to a framework of cooperation, the Convention acknowledged political reality while pointing beyond it. The Annexes, with their standards and recommended practices, were never intended to be mere technical appendices; they are the living grammar of international aviation, translating broad principles into operational norms that allow aircraft to move safely from one jurisdiction to another. Compliance with these norms was envisaged not as an act of submission, but as a rational expression of enlightened self-interest.
Over time, however, the balance carefully struck at Chicago has come under strain. States increasingly invoke sovereignty not as a responsibility within an international system, but as a justification for deviation from it. Differences notified under Article 38 of the Convention, once an exceptional mechanism to address genuine constraints, risk becoming normalized instruments of regulatory exceptionalism. While flexibility is essential in a diverse global community, habitual deviation corrodes the very harmonization upon which aviation depends. An aircraft cannot meaningfully adapt to a new legal philosophy each time it crosses a border; predictability and uniformity are not conveniences but conditions of safety.
This tension has been exacerbated by the evolution of aviation itself. The industry of 2026 is no longer defined solely by traditional airlines and airports. It encompasses unmanned aircraft systems, advanced air mobility, privatized service provision, and digitalized air traffic management. Each innovation brings regulatory challenges that tempt States to act unilaterally, crafting bespoke national regimes that respond swiftly to domestic pressures but sit uneasily with international norms. The risk is not merely legal fragmentation but the erosion of trust. Aviation functions on mutual confidence: confidence that standards are comparable, oversight is credible, and rules mean the same thing on both sides of a border.
International law, particularly in aviation, has never derived its authority from coercion. There is no global aviation police force to compel compliance with ICAO standards. The strength of the system lies instead in a shared understanding that deviation carries collective costs. When one State weakens oversight or disregards agreed norms, the consequences are rarely confined within its borders. Safety deficiencies, security vulnerabilities, and environmental externalities propagate through the interconnected web of global air transport. Harmonization, therefore, is not an ideological aspiration but a functional necessity.
My Book
It is against this backdrop that my book, Is Air Law International: Perspectives from Practice and Global Regulation (Ethics Press: November 2025), was written. The book does not pose its titular question rhetorically; it interrogates the very meaning of “internationality” in a legal regime that depends on sovereign consent for its existence. Drawing on decades of engagement with ICAO processes, treaty interpretation, and State practice, the book argues that air law is international not because it transcends States, but because it is sustained by their continuous commitment to a shared normative order. It examines how treaties, standards, and institutional practices interact with domestic legal systems, revealing a legal ecosystem that is at once fragile and resilient. Fragile, because it relies on trust rather than force; resilient, because it has endured precisely by accommodating diversity within a framework of common purpose.
The central insight of that work—that air law is international in aspiration but domestic in execution—should not be read as a concession to fragmentation. Rather, it is a call to responsibility. Domestic execution is the point at which international law either succeeds or fails. Courts, regulators, and policymakers are the custodians of international norms within their jurisdictions. When they interpret Annexes narrowly, apply standards selectively, or subordinate international obligations to short-term political considerations, they weaken the system not only for others but for themselves. Conversely, when they internalize international standards as integral components of domestic law, they reinforce a culture of compliance that benefits the entire aviation community.
As 2026 approaches, the aviation community must therefore recalibrate its understanding of sovereignty. Sovereignty in aviation cannot be absolute in the classical sense; it is relational. The freedom of one State to regulate its airspace is inseparable from its obligation to do so in a manner consistent with the expectations of others. This is not a diminution of sovereignty but its modern expression. In an interconnected world, autonomy without coordination is an illusion. True regulatory authority lies in the ability to participate effectively in collective rule-making and to implement those rules faithfully at home.
ICAO’s role in this recalibration is pivotal. The Organization must continue to serve as the forum where technical expertise tempers political impulse, and where consensus is patiently forged. Yet the responsibility does not rest with ICAO alone. The aviation community—States, airlines, manufacturers, service providers, and professionals—must embrace a shared ethic of compliance. Compliance should not be viewed as a burdensome obligation imposed from Montreal, but as a professional standard akin to airmanship itself. Just as pilots adhere to common rules of the air regardless of nationality, regulators and policymakers should adhere to common legal norms regardless of domestic pressure.
Education and narrative matter in this regard. Air law must be taught and discussed not as a collection of isolated national regulations, but as a coherent international system with a moral and practical logic. The Chicago Convention and its Annexes embody more than technical prescriptions; they reflect a philosophy of cooperation born out of historical necessity. Recalling that philosophy is essential at a time when multilateralism is often portrayed as weakness rather than wisdom. Aviation’s success story stands as quiet rebuttal to that narrative. Few other sectors demonstrate so clearly that global rules, when respected, can deliver safety, efficiency, and growth on an unprecedented scale.
There is also a need for humility. No State, however advanced its aviation sector, is immune from error. Peer review, audit mechanisms, and transparency are not affronts to national dignity but instruments of collective learning. The Universal Safety Oversight Audit Programme and similar initiatives should be embraced not defensively but constructively. Compliance is not a static achievement but an ongoing process, one that requires constant vigilance and willingness to adapt.
Looking ahead, the choice facing the aviation community is stark. One path leads toward regulatory particularism, where States increasingly privilege individual policy preferences over international consensus. That path may offer short-term flexibility but carries long-term risks of fragmentation, reduced safety margins, and diminished trust. The other path leads toward renewed commitment to harmonization, where international norms are treated as the default framework within which national policy operates. That path demands discipline and patience, but it aligns with the fundamental logic of aviation as a global enterprise.
My Take
If I were to distill my own position on this question, it would be this: air law in 2026 must be understood less as a battlefield between sovereignty and internationalism, and more as a covenant of responsibility among States. The Chicago Convention did not seek to abolish sovereignty; it sought to civilize it. In doing so, it offered a model of international law that is neither utopian nor coercive, but pragmatic and principled. The erosion of that model would not occur through dramatic repudiation, but through quiet neglect—through the cumulative effect of small deviations, unchallenged differences, and unexamined exceptions.
The aviation community must resist the temptation to treat international norms as optional guidelines rather than binding commitments. Compliance should be the presumption, deviation the exception, and justification the rule. Where differences are genuinely necessary, they should be transparent, proportionate, and temporary. Above all, they should be animated by a spirit of fidelity to the collective enterprise of aviation, not by parochial advantage.
In Is Air Law International, I argued that the true test of international law is not its textual elegance but its lived reality. That reality is shaped daily by regulators issuing certificates, inspectors conducting audits, judges interpreting conventions, and policymakers deciding whether to align domestic law with international standards. Each of these acts either reinforces or weakens the invisible architecture that keeps aircraft safely aloft across borders. The internationality of air law is thus not a given; it is a choice, renewed every day.
As we move into 2026, that choice becomes more consequential. Technological innovation will outpace regulation unless anchored in common norms. Geopolitical tension will tempt unilateralism unless counterbalanced by institutional trust. Environmental imperatives will demand coordinated action that no State can achieve alone. In this context, harmonization is not nostalgia for a bygone multilateral order; it is a strategic necessity.
My hope—and my conviction—is that the aviation community will rediscover the quiet wisdom embedded in the Chicago Convention and its Annexes. They remind us that the skies belong to no one State, yet are the responsibility of all. To govern them effectively requires not the assertion of isolated will, but the disciplined exercise of shared commitment. In that sense, air law will remain international not because we declare it so, but because we choose, collectively and consistently, to make it so.
