Two groups of forty subjects each were presented with three minute noise exposures. Test stimuli consisted of four types of interior aircraft noise (two commercial jets, general aviation, helicopter), each presented at levels of 85, 80, 75, and 70 dBA. Subjects were seated in pairs in a transportation system simulator. During the noise exposures one subject group was instructed to converse while the other group was instructed to remain silent. After each noise presentation all subjects rated the annoyance of the noise, judged its acceptability, and estimated how long they could travel in the noise without discomfort. Responses by the speech group were more critical than the reverie group on all three measures. Annoyance ratings and acceptance judgments were approximately 3 dB more severe at low noise levels and approximately 1 dB more severe at high noise levels for the speech group. [Work supported by NASA.]