NEW YORK (AP) — In America, businessmen shake hands. In Japan, they bow. But all over the world airline executives engage in a greeting that is all their own: the exchange of model airplanes.

When airlines start flying to new cities, make deals with other carriers or finance new jets, these high-quality models — typically one to two feet long — provide the perfect photo backdrop, can help break the ice or serve as a cherished "thank you."