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Some time ago...
After the children had saved the world from the mind control device at the concert in Paris, they were back in America, all of them (including Libby) gathered around
"—CHILDREN!" Zed exclaimed. "YOUR ASSISTANCE IS REQUIRED IMMEDIATELY!! MEET ME IN ALASKA!"
"Well, guys..." Junior said, pressing a button on his treehouse. "DUTY CALLS!"
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As a celebratory gift for saving the world, Junior and the children had gotten a large jet plane for all five of them, stacked to the brim with all sorts of gadgets. The thing is, The adult veggies were on a trip to Alaska to preach to a tribe of Iñupiat vegetables right around the same time that the kids were going on the mission from Zed!
"What's the mission, mister Zed?" Junior asked the small hologram of the leader of C.R.I.S.P.
"Your mission, should you choose to accept it," Zed spoke, "is to stop an unknown C.R.I.S.P. enemy from making every predatory animal in the state turn on the population. You must find him at the top of the Denali national park, and defeat him using your arsenal of gadgets I've place into the plane."
"Well, that sounds easy enough!" Percy replied with a big ol' smile on his face.
"One more question, mister Zed.." Junior spoke.
"Yes, Junior?" Zed asked.
"—How do you land this thing?"