It's a good question. I don't have the answer to that. Certainly we did have the specific strings attached to Air Canada for almost 30 years and they're still officially attached.
I'll turn to my colleagues. I don't know whether other countries have similar.... There are state-run airlines in other countries, but in terms of independent carriers I don't know the answer to the question. I suspect it's probably unusual.
May I ask my associate deputy minister to speak on that?