Udvar-Házy was in his 20s during the later part of transition from propeller aircraft to jets during the mid to late 1960s, and realized that the higher capital investment required to purchase jet aircraft created an opportunity for a leasing Business. He founded ILFC with Leslie Gonda and his son Louis Gonda in 1973, leasing a single used Douglas DC-8 to Aeroméxico. He left ILFC in February 2010 to found Air Lease Corporation.