Narrative:

New orleans approach cleared us for a visual approach to runway 36L at new. We switched to tower and were cleared to land number 2 following citation on short final whom we had in sight. I looked out of my window to make sure final was clear when I spotted traffic that was apparently lining up for final as well. I immediately notified the captain; I called traffic again and this time visually pointed him out. Traffic had not changed course and was 3 o'clock and closing. Their trajectory looked to have them pass underneath us but they hadn't started deviating. The captain pushed the power up and began to climb; and told tower we were taking evasive action for traffic also on final. At that time the other aircraft finally made contact with the tower for the first time; saying they had us in sight; and the tower requested they make a right 360 with which they complied. Other aircraft [was] under the class B shelf of new orleans airspace and they hadn't attempted to contact a controller.

Google
 

Original NASA ASRS Text

Title: Small Transport First Officer reported an NMAC on approach to NEW airport.

Narrative: New Orleans approach cleared us for a visual approach to runway 36L at NEW. We switched to Tower and were cleared to land number 2 following Citation on short final whom we had in sight. I looked out of my window to make sure final was clear when I spotted traffic that was apparently lining up for final as well. I immediately notified the Captain; I called traffic again and this time visually pointed him out. Traffic had not changed course and was 3 o'clock and closing. Their trajectory looked to have them pass underneath us but they hadn't started deviating. The Captain pushed the power up and began to climb; and told Tower we were taking evasive action for traffic also on final. At that time the other aircraft finally made contact with the Tower for the first time; saying they had us in sight; and the Tower requested they make a right 360 with which they complied. Other aircraft [was] under the Class B shelf of New Orleans airspace and they hadn't attempted to contact a Controller.

Data retrieved from NASA's ASRS site 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.