The difference Susan experiences between her American clients and her Austrian clients is mainly due to
This refers to the display of emotions which people from a certain culture has in response to particular situations.
With this in mind, we can see that as a result of display norms, Susan, the flight attendant feels frustrated with American passengers who tend to show more emotions during high stress situations when compared to Austrian passengers.
Read more about display norms here:
https://brainly.com/question/3521350