Tucson to Los Angeles

The flight back from Tucson to LA took a bit longer than expected. We were due to depart Tucson at 1835, but our plane was utilized for another service which meant our flight was cancelled! They routed us via San Diego, departing Tucson at 1945. We have never been to San Deigeo before, not sure if we have now. We were kept on the plane on the ground after the San Dieo passengers disembarked. We were held up for a while due to incorrect head counts on board and then by a slot delay to Los Angeles. But, we made it - and only two and half hours late. P.S. it is freezing in Los Angeles!