Canadair Regional Jet CRJ-200 (N963SW)

My flight to SLC was delayed because there was a fuel leak in the APU, which ignited as the aircraft pulled up to the gate. I snapped a couple photos the moment I saw flames spouting out of the side of the APU, as my camera was already up and ready, looking for rare liveries. None of the passengers besides me seemed to notice the incident, as the fuel burned up quickly, but there were plenty of complaints after our flight was delayed by 2 hours so we could board another plane.