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One of the dogs in SFO's "Wag Brigade." San Francisco International Airport

Air travel is stressful. Puppies are adorable. So why not put the two together to make for a happier flying experience?

Some airports around the U.S. and Canada are doing just that, by offering "comfort dogs" that can help soothe harried travelers. These pooches (and their handlers) roam the terminals at about 20 airports in North America, where passengers can greet and pet them -- and take in some of the scientifically proven stress relief that animals provide.

LAX: Los Angeles International Airport's Pets Unstressing Passengers (PUP) program has 30 dogs ready to serve, like this these cuties, Hazel and Barnes:

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Hazel and Barnes are ready to soothe harried travelers. LAX PUP program

GRR: Gerald Ford International Airport in Grand Rapids, Michigan, has nine dogs outfitted in "Pet Me" vests that roam the airport at peak hours, ready to offer a paw to shake or a belly to rub.

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A toddler laughs at Pavlova, one of the dogs in GRR's "Gentle Fur In Action" program. Gerald R. Ford International Airport

MIA: Miami International Airport is home to Casey, a 69-pound golden retriever who is the airport's K-9 volunteer ambassador. Casey even has her own Web page and email address (casey@miami-airport.com) so passengers can stay in touch.

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Casey and her handler, Liz Miller, greet passengers at Miami International Airport. Miami International Airport

SFO: The San Francisco International Airport has its own "Wag Brigade" of 22 dogs ready to greet travelers passing through the Golden Gate city.

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The Wag Brigade's Kirk spreads the love to a young SFO visitor. San Francisco International Airport

EIA: Edmonton International Airport in Alberta says it's the first Canadian airport to offer pet therapy. The airport teamed up with the Pet Therapy Society of Northern Alberta to bring the furry visitors to the airport.

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The dogs and their handlers walk the concourse at EIA, ready to meet and greet with passengers. Edmonton International Airport