. >> pigs are not expected to fly, lilou gets plenty of attention when she shows up at san franciscoernational air port. >> not every day you see a pig in the airport but is there one right there. >> reporter: for stressed, weary holiday travelers lilou provides a much needed comfort and joy. >> she's a pig. >> reporter: a pig with her own instagram page filled with her happening it up. she also spreads joy by visiting hospitals and nurses homes. and, there is nothing like an airport. lilou's owner, tatiana. >> people can totally tell how stressed they were and they are like there is a pig. some would even squeal. >> reporter: squeal when they saw a pig. >> yes, they would squeal when they see a pig. >> reporter: lilewis new member of what the airport calls its wag brigade, the others are especially trained dogs like pickito who come to regularly help those afraid of flying or anxious over missed connections or long delays. >> it reduces depression and anxiety. >> jennifer handling works with the airport, to train the wag brigade as four legged therapists. animals can do that, better

lilou's owner. >> you can tell how stressed they were and they are like there is a pig.squeal. >> reporter: they would squeal when they saw a pig. >> yes, they would squeal when they saw a pig. >> reporter: the new member of what the airport calls its wag brigade, the others are specially trained dogs like pi keyto to come who help those who air frayed to fly other anxious over missed connections or long delays. >> it reducis, depression, anxiety. >> reporter: jeffery from the san francisco spca work with the airport to train the wag brigade as four legged therapist. animals can do that better than people can do it. >> yes, animals have non- judgmental unconditional love they are giving you. >> reporter: it is often love at first sight when lilewis around. >> hi, hello. >> reporter: perhaps the only ones not the happy to see her, are those other members of the wag brigade, you can only watch, as lilou hogs the spotlight. john blackstone, cbs news, san francisco. >> i would take the dog or the pig. >>> it the is story of the space program you probably haven't heard before