Air Canada has become the first "overseas" carrier to join TSA's PreCheck program that allows program members to move through airport security faster, and with less unpacking and undressing. TSA says more carriers will soon follow. For reasons that should be obvious, Air Canada serves more U.S. cities than any other foreign airline.
The PreCheck program can be applied for ($85 for 5 years) and is also available to some elite frequent flier program members, and to members of other government security programs such as GlobalEntry. From USA Today, more DETAILS