Dreams about airplanes, like dreams about all modes of transportation, may be addressing the path you are on in life, how fast you are moving and how much you are in control of your life. Consider what the plane is doing, who you are and where you are on the plane for further insight.
Dreaming of elephants may represent your memory in general or a specific, perhaps repressed, memory that may be trying to emerge from your unconscious; may be referencing something from your past that you keep remembering or bringing up and which you need to release or let go as it no longer applies to the present.
Your grandparents in a dream may represent love, protection, wisdom, family values and tradition. Your grandmother may be the archetypal Wise Old Woman and your grandfather may be the archetypal Wise Old Man.
Spiders in a dream may represent different things and will depend on how you feel about spiders. Spider dreams can be either negative or positive in nature. Often a spider is associated with the aspects of feminine energy and therefore may represent a woman in your life. This will likely be a strong, overbearing mother or another powerful woman. It may also represent the archetypal feminine energy within yourself or an aspect of yourself. A spider in a dream may also represent other aspects of the feminine archetype.
Pregnancy is all about the creation and development of life, so dreaming of being pregnant may be a metaphor for the birth of something in your life, such as a new idea, project or goal. It may also symbolize an aspect of yourself that is developing or growing.
A dream about a swimming pool or any pool of water may be referring to the unconscious and/or your emotions; may suggest that you are exploring your unconscious and trying to get to know, understand and appreciate yourself more.
Shopping, in general, may represent needs or desires that you are looking to fill. Perhaps you are “shopping around” -- considering your available choices in a decision you need to make. Consider the kind of store you are shopping in and if you will find what you need in this store. If not, maybe you are looking in the wrong place for something in waking life.