Optical tracking of airborne targets typically involves initial acquisition by radar at long range and relatively high measurement error. The target is then passed to an electro-optical tracker with a WFOV and precision tracking begins. The problem can include a second handoff to a NFOV sensor for additional resolution. A stringent mission time line requires these handoffs to be executed quickly. In this paper, traditional approaches to these handoff problems are reviewed and a new solution is presented at the system level. The authors discuss problems uncovered in the integration and testing phase and show results from an extensive HWIL testing platform.