Narrative:

Airport NOTAM for runway closed until XA00 local for adjacent construction work. I took off at XA05 local with no X marks on runway. Someone said on radio after I took off the airport was still closed.

Google
 

Original NASA ASRS Text

Title: SMA PLT FOUND NO CLOSED MARKINGS ON RWY THAT WAS SUPPOSED TO BE CLOSED. THE RWY WAS NOTAMED TO OPEN 5 MINS BEFORE THE PLT BEGAN TKOF. HE WAS TOLD THE RWY WAS STILL CLOSED AT 2V2.

Narrative: ARPT NOTAM FOR RWY CLOSED UNTIL XA00 LOCAL FOR ADJACENT CONSTRUCTION WORK. I TOOK OFF AT XA05 LOCAL WITH NO X MARKS ON RWY. SOMEONE SAID ON RADIO AFTER I TOOK OFF THE ARPT WAS STILL CLOSED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.