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Old Apr 10, 2017 | 3:08 pm
  #129  
canadiancow
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Originally Posted by eigenvector
It stands for One Stop Security and it means you won't have to go through transit security for your connecting flight.

http://news.gc.ca/web/article-en.do?nid=1036799&tp=1
US to international at YYZ has never required security any time I've done it.

Only domestic or US connections required anything.
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