In this case, it isn't a contract. There's a memorandum of understanding with the United States. This is a nation-to-nation agreement. Canada is part of a group of allies that are purchasing CF-35s.
Canada's memorandum of understanding calls for 88 planes to be delivered to Canada. That's why Canada is part of the joint strike fighter program office. It's so they can keep on top of the cost and the latest upgrades that are needed in buildings and so on.
This is unique. It's not like entering into a contract to buy 88 cars; this is about having fighter planes that are compatible with those of our allies.