A hydrogen generator fueled by ammonia borane (AB) was newly designed to continuously power an unmanned aerial vehicle (UAV) for 57 min using a 200-We polymer electrolyte membrane fuel cell (PEMFC). The developed generator was demonstrated to produce 3.8 L(H2) min-1 autothermally employing tetraethylene glycol dimethyl ether (T4EGDE) as an additive. The H2-generator was integrated with a commercial PEMFC to construct a power-pack. Upon flight tests, a hybridized power management system (PMS) possessing the fuel cell and an auxiliary lithium-ion battery initially provided 500 We for take-off while the fuel cell supplied 150 - 200 We upon cruising. The effluents containing H2 were further purified using solid absorbents. To evaluate the remaining filter capacity of the absorbents, a real-time monitoring system was utilized. On the basis of these results, a viable reactor concept was discussed for long-term fuel cell implementations.