None of the major carriers has been purchased by foreign carriers or foreign companies or foreign investors. However, there are hundreds and hundreds of smaller operators, and I wouldn't know whether some have received additional investments from foreign entities. Certainly for the major carriers, there's been no takeover or anything like that.
Evidence of meeting #43 for International Trade in the 41st Parliament, 2nd Session. (The original version is on Parliament’s site.) The winning word was carriers.
A recording is available from Parliament.