From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
It can be seen in almost every episode. In fact it's such a popular ship that even Commander Cain had one just like it, which he travels on when Pegasus encounters Galactica (TOS: "The Living Legend, Part I")!
- The constant occurrence of this shuttle is a regrettable result of reuse of special effects footage throughout the Original Series and its negatively-viewed direct successor. This happened due to the high cost of special effects in terms of time and money, particularly at the time both series were produced.