Looking at this flight number:
flightaware.com/live/flight/TSU1 … /KLRD/KGSP
It comes up as CVLT for aircraft, which we use for our Convairs.
However, it says Canadair 66.
It was saying C-131, which what it really is, trips ago. But now it changed to Canadair even AFTER the trips had been completed.
Why do all the CVLT’s come up now as Canadair 66’s? 
Every flight (historical or current) will display what we currently have in our database for the aircraft type code. Many aircraft type codes have several options for their full name, so we try to pick the one that matches most of the fleet (based on a guess or advice from a user).
For CVLT I found the following options:
CVLT | Canadair | CL-66
CVLT | Canadair | CC-109 Cosmopolitan
CVLT | Canadair | CV-580
CVLT | Canadair | Cosmopolitan
CVLT | KELOWNA | CV-5800
CVLT | CONVAIR | CV-640
CVLT | CONVAIR | CV-600
CVLT | CONVAIR | CV-580
CVLT | CONVAIR | C-131H
We’d appreciate it if you could provide some guidance as to which is the most common aircraft using that type code.
We use Convair 580’s.
So the best, when we file CVLT, is to show:
CVLT | CONVAIR | CV-580
We do also operate Convair 5800’s, so those would be:
CVLT | KELOWNA | CV-5800
But, in this case, history in filing has always shown both the 580 and 5800 as:
CVLT | CONVAIR | C-131H
We can only use one name for the fleet of CVLTs, so what I’m looking for is a guess at which of the various subtypes is the most common fleet-wide.
Fair enough 
I would stick with:
CVLT | CONVAIR | C-131H