It's a bird . . . it's a plane . . . it's Phineas and Ferb in the biggest airplane in the world! When the brothers decide it's high time to break the record for the largest airplane ever built, their very own jumbo jet leads to unexpected adventure in the wild blue yonder. Then, when the boys invent an antigravity machine, Major Monogram and Carl the intern become suspicious. Could Phineas and Ferb be working for . . . Dr. Doofenshmirtz? Readers will love this chapter book filled with art from the show.