Narrative:

At XX55 local small aircraft X, upon completion of his touch and go (runway 9), asked to go back to sugarloaf airport on the south side of the keys. He was given a right crosswind departure southbound. When small aircraft X was established on his right crosswind. I switched him to nqx VFR approach control. At approximately XX57 I noticed an aircraft at the northwest corner of the island heading enebnd. About this same time, nqx calls over and says that small aircraft X was leaving our airspace to the north. Evidently small aircraft X while talking to nqx decided he wanted to go around the island (clockwise) before going back to sugarloaf airport. Nqx never coordinated that small aircraft X would be staying in my air traffic area until key said he was leaving the air traffic area. The last I knew small aircraft X was heading south, then was going to turn east out of my air traffic area, not turn back to the west and circle the island. The reason I didn't see him when he was wnw of the island was because our tower position (local and ground control) faces north, where 90% of our traffic comes in. Just prior to noticing small aircraft X at the wnw corner of the island, I departed an small aircraft off runway 27, which could have been a conflict for small aircraft X, since the small aircraft would have been departed right at him at a time *dusk) it is hard seeing to the west.

Google
 

Original NASA ASRS Text

Title: SMA X UNCOORDINATED FLT IN EYW ATA.

Narrative: AT XX55 LCL SMA X, UPON COMPLETION OF HIS TOUCH AND GO (RWY 9), ASKED TO GO BACK TO SUGARLOAF ARPT ON THE S SIDE OF THE KEYS. HE WAS GIVEN A RIGHT XWIND DEP SBND. WHEN SMA X WAS ESTABLISHED ON HIS RIGHT XWIND. I SWITCHED HIM TO NQX VFR APCH CTL. AT APPROX XX57 I NOTICED AN ACFT AT THE NW CORNER OF THE ISLAND HDG ENEBND. ABOUT THIS SAME TIME, NQX CALLS OVER AND SAYS THAT SMA X WAS LEAVING OUR AIRSPACE TO THE N. EVIDENTLY SMA X WHILE TALKING TO NQX DECIDED HE WANTED TO GO AROUND THE ISLAND (CLOCKWISE) BEFORE GOING BACK TO SUGARLOAF ARPT. NQX NEVER COORDINATED THAT SMA X WOULD BE STAYING IN MY ATA UNTIL KEY SAID HE WAS LEAVING THE ATA. THE LAST I KNEW SMA X WAS HDG S, THEN WAS GOING TO TURN E OUT OF MY ATA, NOT TURN BACK TO THE W AND CIRCLE THE ISLAND. THE REASON I DIDN'T SEE HIM WHEN HE WAS WNW OF THE ISLAND WAS BECAUSE OUR TWR POS (LCL AND GND CTL) FACES N, WHERE 90% OF OUR TFC COMES IN. JUST PRIOR TO NOTICING SMA X AT THE WNW CORNER OF THE ISLAND, I DEPARTED AN SMA OFF RWY 27, WHICH COULD HAVE BEEN A CONFLICT FOR SMA X, SINCE THE SMA WOULD HAVE BEEN DEPARTED RIGHT AT HIM AT A TIME *DUSK) IT IS HARD SEEING TO THE W.

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.