Narrative:

Aircraft cleared to 11000 ft. Read back 10000 ft and leveled off at 10000 ft. Altitude confirmed in cockpit by other crew member as 10000 ft. ATC said 'no problem, stay at 10000 ft.' no other traffic in the area.

Google
 

Original NASA ASRS Text

Title: WDB FLC OVERSHOT ALT ON DSCNT IN ZMA AIRSPACE.

Narrative: ACFT CLRED TO 11000 FT. READ BACK 10000 FT AND LEVELED OFF AT 10000 FT. ALT CONFIRMED IN COCKPIT BY OTHER CREW MEMBER AS 10000 FT. ATC SAID 'NO PROB, STAY AT 10000 FT.' NO OTHER TFC IN THE AREA.

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.