Quasinormal and hyponormal weighted composition operators on $H^2$ and   $A^2_{\alpha}$ with linear fractional compositional symbol
  In this paper, we study quasinormal and hyponormal composition operators \W with linear fractional compositional symbol $\ph$ on the Hardy and weighted Bergman spaces. We characterize the quasinormal composition operators induced on $H^{2}$ and $A_{\alpha}^{2}$ by these maps and many such weighted composition operators, showing that they are necessarily normal in all known cases. We eliminate several possibilities for hyponormal weighted composition operators but also give new examples of hyponormal weighted composition operators on $H^2$ which are not quasinormal. 
Mahsa Fatehi, Mahmood Haji Shaabani, Derek Thompson
math.FA math.CV