Well, is it? If you mean adult cartoon as in.... ahem, "adult" cartoon, no,
I don't think that SWAT Kats is an adult cartoon.
SWAT Kats seem to attracted fans from all age groups, although that maybe
it was originaly aimed at kids, the explosion go beyond the target range.
What I think of SWAT Kats is, it is an animated series aimed to people who
are intelligent and who is an adult in their way of thinking (just like
Terra Chang or AJ Freda or Melissa, who are still only 12-13 years old, but
can be consider as an adult).