To start, these are how I interpret your dreams based on what I know.
That being said, here I go;
Your plane crash dream could be many things,
1) perhaps you actually have a fear of flying and this is your mind playing that fear out,
2) a plane can represent freedom, and the plane crashing in your dream is the embodiment your mind gives to a freedom being taken away from you
3) flight can symbolize the everyday struggle to continue on, and a crashing plane could mean you are giving up a struggle
4) falling or crashing can mean the dreamer has failed to achieve a goal
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As for you other dream, well that would take a bit more time to analyze then what I have done for your "plane crash" dream.
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Much more detail is needed to do a real indepth analziation of your dream.
