new words

This morning at the breakfast table as we were eating, a plane flew over outside.  Kate heard it and turned around to look at....the window I guess.  Like she could really see anything.  Anyway, she said, "what's that?"  Aidan then promptly answered her, "that's a plane."  She then repeated, "plane" sand Aidan said, "yes."  It was cute to see Aidan teaching Kate words that he already knows.  I think he has been waiting for her to be able to talk to him.