Thing about it is that the 132 passengers could be from all over the place. It’s a safe bet that many have already left Dallas — including the flight crew.
Additionally, did this person use any of the restrooms? Where did they sit in the boarding area? It goes much deeper than just those on the flight.
Then there are the people in Cleveland she spent 5 days with.
if every passanger made contact with only two other people we have 264 possible cases, and it continues
2 x 264 = 528
2 x 528 = 1056