The Transportation Security Administration is striving to roll out its PreCheck program to 25% of all eligible travelers by the end of this year and to 50% by the end of next year. But writer Joe Sharkey isn't holding his breath, citing the TSA's recent actions on the knife rule and scanner removals. "Still, new enrollment centers will need to be built, in many cases at airports where security areas are already seriously crowded and limited by space," Sharkey writes.

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