Hangar

[fadel]

so can fighter, bombers travel alone from a galaxy to another or from a planet to another?

or they need big ships like cuiser,battleships,battlecruiser.... to move them?

[Despot]

All ships are capable of moving any distance in theory, although ships with heavy fuel consumption like bombers and destroyers will need freighters with them to carry extra fuel on long journeys. As long as your cargo space exceeds the fuel requirement, the movement is allowed. You can always reduce the speed of the fleet in order to cut fuel costs.