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Civil Aviation Bill

My Lords, it is not unreasonable to suggest that evidence can arrive at any stage. We already know that commercial aircraft flying to the United States may get turned back because intelligence comes about the nature of the passengers. Are we not signatories to the Tokyo convention? When we signed article 4, we must have conceived that it was possible that we might have to interfere with an aircraft as it transited through UK airspace, because it was necessary,"““to ensure the observance of any obligation of such State under a multilateral international agreement””." To say that this is impossible seems strange. Can the Minister explain how he reaches that conclusion?