It depends on the movie story. In some cases there are invasions on large scale, in other cases abductions. Many more scenarios could be: governmental conspiracy, friendly aliens..
One example of a science fiction plot is "first contact." How would be treat aliens from another planet? How would these aliens treat us?
Xenophobia is fear/hatred of other species, usually used in science fiction to describe hatred towards aliens.
Human contact with aliens in fiction is by necessity science fiction. The genre is defined by speculative science or technology, the very existence of alien life is at this stage speculative science and the ability to travel between planets(either by us or the aliens) is currently speculative technology.
Many science fiction shows have rockets, aliens and fantastic weapons. Other big topics are traveling to the future or the past.
Yes , aliens are often prominently featured in science fiction ; for example "The Silke" by A.E van Vogt .
A good title for a science fiction novel about a hawaiian airline is "Aliens in Paradise." The paradise can be the airline on its way to Hawaii and you can decide what the aliens are.
Some good science fiction storys about humans from an alien's POV are Dave's Natterings and Gotta Have Aliens.
Autobiographical science fiction would be the fictional life of a character told from his perspective. Slaughterhouse Five is a autobiographical science fiction novel. It has time travel and aliens as well as Kurt Vonnegut's wartime experiences in the Dresden bombings.
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It is science fiction. Science fiction generally bases a fictional story about a debatable scientific point like time travel, aliens and other disputed ideas.
Star Trek, Stargate, Invasion, Farscape, Aliens, Predator, Matrix ..
S for Space is a collection of science fiction short stories about space travel, time machines and aliens. It was written in 1956.