An aircraft noise adaptation model is being developed at Langley Research Center to account for the variability in the responses of subjects participating in noise experiments. The principal concept of the model is a measured “aircraft adaptation level” which represents a noise annoyance calibration for each individual. The model assumes that annoyance response is a function of the interpretation of an aircraft noise by a person relative to his frame of reference or aircraft noise adaptation level. Psychoacoustic investigations were conducted at laboratories in Virginia and New York City as well as a noise survey of residential communities surrounding John F. Kennedy International Airport for development of the model. The results indicated that measured aircraft adaptation level (calibration) can help explain response variability but these levels themselves are not predicted by either attitude-personality indices collected from each individual or aircraft/street noise impact information collected from a person's residence. Furthermore, the annoyance responses of subjects did not vary as a function of the noise environment (aircraft/street) of a person's residence. Thus, group differences of annoyance responses were traced to the selection of subjects from different geographic areas rather than from different aircraft noise impact areas.