i have heard of imports coming from germany twelve at adults at a time --i had acaquaintances that owned kennels in germany as well as usa and this is how they imported police and schuthzund titled dogs for sale . however i think that these are /were chartered flights .. the flights did exist in the past but I am not 100% sure about the present .. however you can look into this type of an arrangement for yourself with a variety of airlines .good luck
There is a difference if you travel with the dog compared to shipping it cargo.
If you travel with the dog, the size of the plane(s)used on that particular route will determine how many crates they have room for. If your final destination is a smaller airport in the US, and you have to switch planes along the way, a smaller aircraft may not be able to accommodate 500 and 600 series crates for the lesser routes, or have a max of one 500 crate. A smaller aircraft may also lack a heated cargo hold and cannot take on dogs during the winter months. In summer, there may be heat embargos in place for smaller destinations. Best to inquire with the airline directly in this case. From my personal experience, your travel agent is little help in this situation. Also - have the airline fax the information to you, that x number of dogs are booked AND confirmed on your flight and very important - at which price. I have found myself in the situation several times when I got to the counter (you pay excess baggage at the time of check in, and they often to not take VISA, cash only. You pay each time - once when you fly out and again at your return flight) and all of the sudden the price was different. If higher, thank Goodness I had a fax from the airline which was then binding. If the price ends up being lower (has also happened) I use that of course :o).
If your dog is shipped as excess baggage it will have priority over regular animal cargo, so that you and your "baggage" are not separated along the way. Always providing the planes used for the routing can accommodate the baggage you bring. Also, when you travel with a dog IMO expericence a 500 crate (75cm tall) will do fine for a male that is up to 65cm tall. Smaller females can sometimes travel in 400 series crates. Currogated cardboard works best for absorbent material, it also insulates the bottom of the crate against cold.
Prices for dogs as excess baggage vary greatly from airline to airline. Cheapest is usually Delta, but I personally have had some horrific experiences with them and rather pay more than ever fly Delta again. Lufthansa is known to have THE best animal handling for all airlines (example - they have animal stations at every airport they service directly). They also have some of the best people service such as good food, good inflight service and air quality, adequate seating room, especially leg room. Also, because Lufthansa has its own animal stations, they have no heat or cold embargos for travelling pets (with passenger or as cargo) to any destination they service directly. Close second IMO is KLM.
Finally, the airline may limit the number of crates each passenger can travel with. That varies from airline to airline. Again, Delta is the most lenient here.
When you ship dogs cargo, the number of dogs is unlimited. If you have a larger shipment, it will go on a cargo plane, rather than a passenger flight. The more dogs you ship at one time, the better the price per dog usually. You have to haggle a bit with GK or Petair to get the best price. You have to use those two when shipping a dog out of Germany via cargo. For cargo, rule of thumb is 500 series crate for an adult female, 600 series crate for an adult male. The shipping companies supply the crates at a better price than retail.
One thing to consider when shipping a larger number of dogs at once is that after a certain number of dogs has been exceeded, it is considered a commercial shipment and will be dealt with accordinly at customs when the dogs enter the country.