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Lung biopsy tissue and lung fluids were examined and found to have HIV. So you can obviously draw the conclusion that the virus is able to survive in the lungs, and can be coughed out.
However, to day, not a single case of HIV transmission has been attributed to airborne HIV viruses. About 5 years ago an invected HIV dentist supposively transmitted the disease to a patient via Air Exposure, this could not be verified as factual. The reason for this is rather unknown, at least at this point no documentation of such transmission has occured.