That's a very good question, sir.
Now, the period of time when there is a risk of modification is during the flight tests, when we're still discovering things with the airplane. That will be long past by the time Canada takes delivery of her airplanes.
We talk about low-rate initial production. It's an acquisition term used in the United States that says the United States is not permitted, by acquisition law, to go to a multi-year procurement until completion of operational tests. So at the time the operational test is completed, at that point, the United States will be able to buy airplanes in either three-year or five-year increments instead of annual increments. So during the years when we're buying the airplanes one year at a time, that's referred to as low-rate initial production.
I'd like to make one last comment, sir. In the year that Canada is buying, we are building over 200 airplanes that year. It's not “low rate” by anybody's definition in terms of the dictionary, but it's still termed low rate because we're not in the multi-year yet.