Birch's grandfather has always wanted to fly all the way across the United States in his antique Piper Club. But now that Birch's grandmother has died and he's moving into a retirement community, he's decided to sell the plane. As Birch and her mother help him pack up the house, Birch knows that his spirits as well as his time are running out. He's just not the same old Pop.

Much to Birch's surprise, it's easy to convince Pop to take off on a short trip on the spur of the moment. Now Birch wonders how hard it can be to talk him into making the big on and taking her along.