Spaceline Location – Mission cards are seeded to form one or more spacelines, representing different
quadrants of the galaxy. Gamma, Delta, and Mirror Quadrant missions have a Γ, ∆, or M symbol in their point boxes. Missions with no symbol are Alpha Quadrant missions. All missions may be seeded only on the appropriate spaceline. Spaceline locations may not be moved between quadrants by cards that relocate locations.
The effects of a card which references the “spaceline” apply only to the quadrant where it is played or encountered.

For example, you may rearrange only the spaceline (quadrant) where your opponent failed a Q dilemma; TheTraveler allows a ship to move only within one spaceline.

See movement between quadrants, time travel.