There are not many websites with only aviation cartoons. The ones I have found are included, but first the websites from contributing artists of book "Good Landing:

Ton van Andel
Philippe Abbet
Johan Baas
Roger Brunel
Gary Clark
Nina Dietrich
Toon van Driel
Fabian Goossens
Michael Hopkins

Bob Leenders
Chris Manno
Barry Munden
Mike Ray
Stefan Strasser
Dimitri Verdoodt