Originally Posted by tracon
Cubana is not allowed to overfly american airspace. They stop in YQX on there way to/from Europe.
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Cubana have a specified air route that they are allowed to fly when going from HAV to YYZ. No deviations allowed. The same for American carriers who over fly Cuba.
Cubana stops in YQX because their aircraft do not have the range for non-stop to Europe.