You may dream of being in a spaceship when you are exploring aspirations that you feel may not be grounded or practical. If the spaceship is descending to the earth, you may be finding ways to make your goals more attainable. Something about what you are doing may not be supported by those around you. Unlike the plane, which signifies moving to achieve your ambitions, the 'space' association of this type of vehicle can show the need to approach your goals in a more practical way. See also AliensandRocket.