Scandinavian Airlines (SAS) highlights a list of six carriers that joined the TSA PreCheck program last week.

Also joining the program were the European leisure airlines Condor, Thomas Cook Scandinavia and Thomas Cook UK.

Air Serbia and Toronto-based regional carrier Porter Airlines are the other new PreCheck members.

Entry of the new airlines brings to 52 the number of carriers that are participating in expedited airport security-screening program.

U.S. citizens and permanent residents can join PreCheck for five years at a cost of $85.