Соответствующая норма
Canada
Practice Relating to Rule 7. The Principle of Distinction between Civilian Objects and Military Objectives
Section E. Attacks against civilian means of transportation
Canada’s LOAC Manual (1999) states that civilian aircraft and vehicles are military objectives “if they contain combatants, military equipment or supplies”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-2, § 10.
With respect to civil aircraft, the manual specifies:
Civil aircraft (including state aircraft which are not military aircraft) in flight should not be attacked. They are presumed to be carrying civilians who may not be made the object of direct attack. If there is doubt as to the status of civil aircraft, it should be called upon to clarify that status. If it fails to do so, or is engaged in support of military activities, such as ferrying troops, it may be attacked. Civil aircraft should avoid entering areas which have been declared combat zones by the belligerents, since this increases the risk of their being attacked. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 7-4, § 38.
Canada’s LOAC Manual (2001) states in its chapter on targeting:
Civil aircraft (including state aircraft which are not military aircraft) in flight should not be attacked. They are presumed to be carrying civilians who may not be made the object of direct attack. If there is doubt as to the status of civil aircraft, it should be called upon to clarify that status. If it fails to do so, or is engaged in support of military activities, such as ferrying troops, it may be attacked. Civil aircraft should avoid entering areas that have been declared combat zones by the belligerents, since this increases the risk of their being attacked. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 716.2.