A female passenger had been concerned about his [mathematical] writings -- though not just his writings, one suspects.
Guido Menzio is associate professor in the department of Economics at the University of Pennsylvania. One of his specialties is search theory. He was on his way to give a talk in Quebec.
Here he was suddenly having his mathematical intentions searched.
Oh, and he has slightly darker skin. But, as his name suggests, he's Italian -- not, well, whatever other nationality bad people are supposed to be.
He says he was treated with respect at all times and allowed back on the plane, but the female passenger never reappeared.
American Airlines told me that Menzio had been met back at the gate first by a customer service manager and then by a corporate security officer. Sometimes, these are American Airlines employees, but sometimes they are contractors.
"A passenger on AE3950, operated by Air Wisconsin, expressed concerns with another customer's behavior," an American Airlines spokesman told me. "After reviewing the situation, the captain determined the flight should continue. We apologize to our customers for the delay.
One of Menzio's papers is here "Shopping Externalities and Self-Fulfilling Unemployment Fluctuations"
Here are some sample text with some equations.
Here is another paper - Directed Search over a life cycle