T-Rex: Behold, a world much like our own, but with one important difference...

T-Rex: ...the air is much thinner!

T-Rex: As such, flight is impossible, which has changed history SIGNIFICANTLY.
Dromiceiomimus: I mean, not THAT much. We only started flying extremely recently, in historical scales.
T-Rex: ...HUH. I suppose that's true.

T-Rex: Okay, the world is exactly the same, up to the point at which we started flying! THEN it's different.
Utahraptor: Sure!

Utahraptor: But we could still have rocketry, yes? So instead of planes maybe we could ride giant rockets to the other side of the planet instead.
T-Rex: Oh sure! Great! Just one problem: HOW DO YOU STOP THE ROCKETS UPON ARRIVAL, UTAHRAPTOR??

Off panel: Giant trampolines that bounce you to a series of progressively smaller trampolines.
T-Rex: Once again a grim dystopia has become a wonderful utopia, thanks to appropriately deployed trampolines!!