Originally Posted by
Dave Noble
On many routes I travel , it is easy to check someone else in - no id is generally needed for domestic travel here
Heck I've boarded several international flights showing my Nexus (=Canadian Global Entry)! Only at LHR we're they persnickety about wanting to see a passport (they also require using clear plastic bags for carry on liquids, a practice I still can't understand to this day!).
-James