Narrative:

Was instructed to pass directly over the airport from north to south to join a right downwind for runway 9R at 1000 ft. At 1000 ft MSL a banner towing aircraft at 700-800 ft passed directly under us and at the same time tower pointed out traffic. No evasive action was taken, however advance notification would have helped.

Google
 

Original NASA ASRS Text

Title: NMAC.

Narrative: WAS INSTRUCTED TO PASS DIRECTLY OVER THE ARPT FROM N TO S TO JOIN A R DOWNWIND FOR RWY 9R AT 1000 FT. AT 1000 FT MSL A BANNER TOWING ACFT AT 700-800 FT PASSED DIRECTLY UNDER US AND AT THE SAME TIME TWR POINTED OUT TFC. NO EVASIVE ACTION WAS TAKEN, HOWEVER ADVANCE NOTIFICATION WOULD HAVE HELPED.

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.