In September 2003, the Dallas/Fort Worth International (DFW) Airport, a public governmental agency of the cities of Dallas and Fort Worth, contracted with the NTTA through an interlocal agreement (ILA) to utilize the NTTA's electronic toll collection system (the RITE system) and related clearinghouse functions to support DFW parking revenue collection.  It extended the ILA in 2005 to install AVI technology and was soon followed by the City of Dallas, who in March 2005 contracted with the NTTA to use the NTTA's AVI technology for the Dallas Love Field Airport in a similar manner.  The nature of the agreements between the NTTA and the two airports is an exemplary model of successful governmental relations and a text-book case study in the ability of focused, determined public organizations working together for the benefit of their mutual constituents/customers.