Due to the extreme heat this past week, if the flight was going to go without a stop it would have need to bump 40 passengers due to it being weight critical. The other option was to take a full load of passengers and divert for a refueling stop in Canada and then continue on to ANC. They took option 2, which is why it was classified as “accommodating passengers” (the 40 they would have had to bump in DTW).