No air travel. You can't go around to the other side of the planet because that side is always in darkness and is sub zero temps, and the dead lands are always in the light, so super high temps. The only part of the planet that is habitable is the part in the middle where a large moon crosses over the face of the planet that faces the sun.

Thank you,

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"I try to create sympathy for my characters, then turn the monsters loose."
-Stephen King