A tower controller reported working an aircraft that was on final approach to a different airport.

Attributes
ACN	1387834
Time
Date	201609
Local Time Of Day	1801-2400
Place
Locale Reference	CNO.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Aircraft X checked in 3 miles from the final approach fix. I didn't see him where he said he was so I told him to ident. I moved on to my other traffic. When I came back to him I told him I didn't observe his ident and to ident again. I moved back to other traffic. A minute or two later the pilot said he was on short final and need a clearance to land. I cleared him for the option runway 26L. Looking out the window I still couldn't find him so I instructed him to go around. Aircraft X was not at chino airport. It turns out the aircraft was at poc airport. He quickly switch over and received a low approach clearance from that tower controller.don't give clearances until you see them out the window.

Original NASA ASRS Text

Title: A Tower Controller reported working an aircraft that was on final approach to a different airport.

Narrative: Aircraft X checked in 3 miles from the final approach fix. I didn't see him where he said he was so I told him to ident. I moved on to my other traffic. When I came back to him I told him I didn't observe his ident and to ident again. I moved back to other traffic. A minute or two later the pilot said he was on short final and need a clearance to land. I cleared him for the option Runway 26L. Looking out the window I still couldn't find him so I instructed him to go around. Aircraft X was not at Chino airport. It turns out the aircraft was at POC airport. He quickly switch over and received a low approach clearance from that Tower Controller.Don't give clearances until you see them out the window.

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.