Anything that has a date and time in your TripIt itinerary should be showing up in your Planapple itinerary. (Please submit a support request from your trip if this isn't the case.)

Everything in a Planapple itinerary is also in one of your Planapple notebooks: Planapple's model is that you add ideas to a notebook, and then schedule some or all of those ideas into your itinerary. So it's not possible to have something only in the Planapple itinerary without it also appearing in your notebook.

I expected all TripIt items to go directly to the Itinerary section; otherwise I'm just recreating a second itinerary, which is not as useful.