An airline does not have an automatic right to fly scheduled services into every country. International aviation is built on state sovereignty, bilateral agreements and operating permissions.
Article 6 of the Chicago Convention says that no scheduled international air service may operate over or into another contracting state’s territory without that state’s special permission or other authorisation, and it must follow the terms of that permission.
That means a government can, subject to its legal obligations and agreements, restrict or withdraw an airline’s traffic rights. A ban may stop the carrier from landing at airports, selling particular routes or, in some circumstances, using a state’s airspace.
Financial sanctions create a different layer. Even if an aircraft is physically capable of flying, an airline may struggle to pay suppliers, access bank accounts, buy fuel, obtain insurance, lease aircraft or purchase spare parts if sanctions block transactions with designated companies.
Aircraft leasing and maintenance are especially important because modern airlines rely on international networks of lessors, manufacturers, engine companies and repair centres. Restrictions on those services can reduce the number of aircraft an airline can keep safely and legally in operation.
Passengers can then face cancellations, fewer direct routes and higher fares. Airlines may need to reroute through third countries or use alternative carriers, adding time and cost.
Not every aviation restriction is a “sanction”. Airspace can also be closed temporarily for military danger or public safety, and regulators can ground an airline for safety reasons. The legal basis matters.
The practical question is therefore not only whether an airline is named on a sanctions list. It is whether it still has permission to operate, access to airspace and airports, financial services, insurance, maintenance and aircraft. Losing any one of those can sharply reduce international operations.