GA-SMT TAXIING TO PARKING AREA HIT TAIL OF GA-LTT PARKED AT ADJACENT SPOT.

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RETURNED TO ARPT; FOUND OUR ACFT HAD NOT BEEN MOVED. WE FUELED AND PERFORMED PREFLT FOR DEP. WENT INSIDE FBO FOR EXPECTED 2 HR WAIT FOR PAX. LINE MAN CAME INSIDE AND SAID THAT THE SMT Y BESIDE US HAD PAINT WHICH MATCHED OURS ON THE WING TIP AND HE COULD NOT SEE WERE OUR ACFT WAS DAMAGED. WE INSPECTED OUR ACFT AND FOUND SCRAPED PAINT ON OUR TAIL CONE; JUST BELOW THE RUDDER. NO STRUCTURAL DAMAGE; JUST MISSING PAINT. HAD BROKEN NAV LENS COVER AND SLIGHT DENTS ON THE WING TIP; PLUS OUR 'BLUE STRIPES.' CALLED OTHER PLT WHO HAD DEPARTED THE ARPT AND WHEN HE RETURNED; HE STATED HE DIDN'T THINK HE HIT US OR HE WOULDN'T HAVE LEFT. WHEN HE INSPECTED BOTH ACFT; HE STATED THAT HE HAD TO HAVE DONE IT AND STATED HIS REGRETS FOR THE OCCURRENCE. FIELD OPS (THE FIRE DEPT) FILED A RPT WITH THE FAA. WE HAVE TOUCHED UP OUR PAINT AND INSPECTED THE ENTIRE TAIL SECTION OF OUR ACFT. NO FURTHER DAMAGE FOUND. I ROUGHLY MEASURED THE SPACE BTWN OUR ACFT AND THE ONE BEHIND US (THE SPACE THE SMT TRIED TO GO THROUGH); AND IT WAS ABOUT 8' LESS THAN THE SMT'S WING SPAN. THIS DISCOUNTS THE FACT THAT THE SMT WING COULD GO OVER ABOUT 6-7' OF THE SMALLER ACFT'S NOSE. NO LINEMAN HELPED HIM TRY TO GET THROUGH THE HOLE. THE FBO OWNER SAID SHE SAW HIM REVERSE PROPS SEVERAL TIMES GOING BACK AND FORTH TO GET BTWN THE ACFT. IT SUGGEST 1) WING WALKERS OR 2) PARK ELSEWHERE.