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					Originally Posted by  celstu1     Northwest does not give out tags.  I paid for my boys and asked for tags and the woman told me they don't do that just go through.  Thats why I was bummed I paid.  Also the airline does not require health certs.   |  
 
  I flew United and Northwest when I brought Angel home.  Northwest did give out a tag that was attached to her bag and the airline did check the tag before I boarded. 
You will run the risk of losing your flight if you don't make the reservation before hand.  Northwest does not allow you to pay for the pet when you make your reservation, you must go to the ticket counter.  But every major airline that does allow pets has a rule as to how many can be in the cabin during any flight and it is usually two.  So, if you don't make the reservation beforehand, get told at the boarding area that you have to go back and pay and there are already other pets on that flight, you won't be able to fly. 
It is also a smart idea to always have your health certificate.  Most airlines have it is a mandatory condition if you look on their website.  Again, IF they ask to see it and you don't have it, you're going to be turned away. 
BTW, the fee for United and Northwest was $80 each way last January.....