As you might have guessed from the title, this episode takes place almost entirely aboard a plane. And as you might have guessed from the series trend, the plot focuses around crooks trying to hijack it by drugging the crew.
The setup is good, and we're immediately introduced to a sizable cast of varied characters, much like in a drawing room mystery. But the episode has little grasp of reality, to the point where it's unintentionally humorous. When I said "drugging", you were probably thinking some powder that dissolves instantly in liquid or something, right? Instead, the stewardess plops a half-dozen **gelcaps** into each pilot's coffee. And we're expected to believe they don't notice all those pills when they drink it! I wish I was making this up.
At the beginning, a teenager is reading a novel about planes and remarks that the technical points are all wrong. I hope that was intentional irony, because even a layman knows that planes don't work the way they're shown here. But the silliest part is when the Hulk, by following orders from the plane-savvy teenager, successfully brings the plane in for a landing! Note to writers: The Hulk gets angry and smashes things. He does not follow orders or pilot aircraft.
This episode has its moments, like the fight in the cargo hold, but there's too much silliness for it to hold together.