Had backend DH from HNL in Oct. Capt dev'd all, I dev'd 2nd leg to MEM. We called Hotels to confirm HNL GT before we left MEM-- said you have GT. Land HNL, called GT dispatch-- said you have GT. Next day at H-hour-- NO GT. Called GT who said FDX Canx'd. Called Hotels who said should have GT. Did OpsRpt- answer was FDX canx'd the morning of the DH. Never did get final answer as to who, how, or why .