I'm (still) aboard AA 887 from DFW to YVR. We had (my first) runway incursion during take-off. Apparently a UA flight crossed after we crossed the 80 knot threshold (felt much faster) and we slammed on the brakes.

We were redirected to a C gate for almost 2 hours with brake temps still very high after 90 minutes. The captain indicated we had external air conditioners trying to reduce the temps for most of that time.

A few of us are curious as to what happens afterwards:
- Is there an official investigation or report?
- Are costs/charges assigned if an aircraft (or controller) is at fault?

Is anyone familiar with the process?