A CL65 FLT CREW TOOK OFF WITHOUT CLRNC FROM CLT.

Narrative

I TAXIED OUT TO RWY 18L AT CLT. WHILE MY FO WAS MAKING THE 'FLT ATTENDANTS PLEASE TAKE YOUR SEATS ANNOUNCEMENT' THE TWR CLRED ME INTO POS AND HOLD. THE TWR TOLD AN ACR FLT BESIDE ME AT SPOT X TO TAXI UP AND HOLD SHORT AND THAT THEY WOULD FOLLOW THE ACR RIGHT OUT. I ERRONEOUSLY BELIEVED THAT I HAD BEEN CLRED FOR TKOF. WHEN MY FO CAME BACK ON COM #1; I TOLD HIM WE WERE CLRED FOR TKOF. I MADE THE TKOF. DURING THE TKOF ROLL I HAD A MOMENT OF DOUBT; I ASKED ON TWR FREQ 'IS ACR CLRED FOR TKOF?' I RECEIVED NO RESPONSE AND CONTINUED THE TKOF. WHEN I ARRIVED AT DEST GND CTL TOLD ME TO CALL THE TWR IN CLT. I CALLED THE TWR. THE PERSON I SPOKE WITH SAID THAT I HAD NOT BEEN CLRED FOR TKOF; THAT THEY HAD XING TFC DOWNFIELD THAT CLRED SAFELY. BUT THIS SET OFF AN ALARM IN THE TWR AND THEY HAD TO FILE A PLTDEV RPT. SUPPLEMENTAL INFO FROM ACN 715443: IT WAS THE LAST DAY OF A 4-DAY TRIP AND THE LAST ROUND-TRIP DEP. WE HAD BOTH BEEN ON DUTY FOR THE DAY APPROX 9 HRS WITH 9 HRS 40 MINS OF REST THE NIGHT PRIOR. BEING THE LAST TRIP OUT AND BACK; IT WAS POSSIBLE THAT THE PF WAS IN A RUSH TO COMPLETE THE TRIP AND GO HOME. INADEQUATE REST OR FATIGUE WAS PROBABLY NOT A CONTRIBUTING FACTOR.