We took him to the vet and of course he acted completely healthy, so she just guessed he had a slight case of rhinitis. Then the moment we got home he was back to sniffling and sneezing!
She didn't prescribe any antibiotics because I give him a light sedative on the plane; if he gets any worse by the time we're back in Paris I'll take him to my vet there. Until then, he is continuing to reverse sneeze, regular sneeze, sniffle, and be stuffed up. Poor little guy!
These don't sound like the symptoms of kennel cough, do they?