Choo Choo Train or Choo Choo Plane?

Okay, so rhyming is confusing to my 20 month old, go figure??? Until now he knew about and could name trains and planes! Now he seems to be confused! We were watching a program earlier on TV about airplanes. Dane looked directly at the screen and said, "Choo Choo Plane!" No matter how many corrections I gave, including going to find trains in the toy box.....it didn't matter! Apparently both words have Choo Choo in front of them!