(Portland, OR)  --  Officials say air travel is nearly back to pre-pandemic levels at Portland International Airport.  The TSA is warning travelers to be prepared for possible delays getting through security checkpoints.  They advise checking the TSA website to know what's allowed in carry-on bags.  The TSA says 29 guns have been found in carry-ons at Oregon airports so far this year, and 24 of those guns were loaded.  Travelers must check guns in locked cases and declare them to the airline, and they can't be loaded.