The "FLT" can and sometimes does refer to a Fleet order..Back in 1993/1994 I ordered a number of B4C (police pursuit package)Z28's for the dealership I worked for. The cars were all ordered on a purchase order through our fleet department, as Chevrolet wasn't building 6 spd cars as quickly on stock or customer ordered cars. We then converted the cars over to retail units, yet they still carried fleet codes on the paperwork..It could be your car was done the same..a way for the dealer to get a car quicker or maybe even for it to be built at all..Just a thought