Principal Issues: 1) Whether the term "three months" contained in Article V(4) of the Canada-U.S. Treaty refers to a consecutive period. 2) Whether “three months” means three calendar months or days totaling an equivalent of three months. 3) Whether the word “use” contained in Article V(4) of the Canada-U.S. Treaty includes standby time and preparation time.
Position: 1) No, the three-month testing period is not required to be consecutive. 2) For the purposes of Article V(4) of the Canada-U.S. Treaty, the testing period of "three months" generally means the aggregation of the number of days in three months. 3) Preparation time is generally not counted towards the testing period while standby time is generally counted.
Reasons: 1) Based on a textual, contextual, and purposive approach to the statutory interpretation of Article V(4) of the Canada-U.S. Treaty. 2) The term “three months” in this context refers to the aggregate time measured by the number of months. 3) Based on the ordinary meaning of the word "use", practical considerations, and industry practice.