If they're arriving on DL, then there's no issue, because they'll be checked and pay upfront, so therefore I (and others) have assumed that they are not arriving on DL. If they were, why would they be posting here?

Good to know about the desks. Also goes some way to explaining why 25% of the time I get some dingus who can't handle the simplest of international trips for pets (Canada--requires only rabies vax) even when the computer is telling her exactly what she has to do.