The airlines are supposed to be the same way. Problem is, adjudicating the status of the service animal is pretty much left up to the discretion of the person working the ticketing counter. Show up with a bunch of "official-looking" documents and they're likely to shrug and be like, "Looks good to me. They don't pay me enough for this crap."
Recently, there are a LOT of DOGS on Celebrity Cruises!!!! But a BLIND man had NO DOG!! These phonies just don;t want to pay for a kennel!! DISGUSTING!
Airlines have to deal with all the states different laws, what crap