<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Sweet Willie:
A rhetorical question, do airlines know who is travelling w/pets in the cabin area? Is it required by a passenger traveling with a pet to mention this to the airline?</font>
Yes you are not allowed to carry on the pet, or check it, unless it has been declared and a fee paid for the transportation of the animal. My dog has flown a few times (always in the hold), and if they are not reserved at least 48 hrs ahead - they will be denied boarding. The fact a pet is on board also shows up on the PAX manifest.